This is taking all of your advice as golden save the toxin sacs on the Heavy carnies.
AS you can see on this list I've added genestealers and significantly reduced my model count of bodies as a result as well as "fixing" the carnies and tyrants. As food for thought I've added reasons for my unit choices as seeds to stimulate better explanation.
Nidzilla Army-1995
HQ-Hive Tyrant-146+138=284
Toxin Sacs 12
Enhanced senses 10
2xTwin-Linked Devourers 24
Extended Carapace 25
Tyrant Guard 46x3=138
(Melee Specialist unit now functions as the quintessential stand and shoot, It is now effectively a 10 wound assault 12 shooting platform with a 2+/3+ armor save, 20% decrease in performance predicted, 50% increase in survivability predicted)
HQ-Hive Tyrant-211
Adrenal Glands(
WS) 4
Adrenal Glands(I) 15
Acid Maw 10
Warp Field 35
Flesh Hooks 4
Toxin Sacs 12
Winged 40
2x Scything Talons 16
(went from combination shoot while charging to just charging and no shooting, Can get to targets at which point 6 attacks on charge will... do what? against assault troops proabably not as well but assuming it gets to its target untouched, could proabably win, 4 wounds can dissappear fast if cordinated fire is directed, 20% performance increase predicted, survivability rate is now 0%)
Elites-1x Carnifex-114
2xTwin Linked Devourer
Enhanced Senses
(Went from slightly longer ranged blast&spray to just double spray, no significant performance change predicted on average, as always lower armor saves make a difference, inconsequential performance changes)
Elites-2x Carnifex-114x2=228
Barbed Strangler
Scything Talons
(No changes from above)
Troops-3x8 Gaunts-72x3=216
Fleshborers 2
Without number 3
(Went from 64 termigaunts to 24 termigaunts with without number, assuming they don't immediately begin falling back to synapse after coming back on after being used as moving shield walls, they might just grab an objective I'll leave behind, Survivability chances are now 1% as opposed to 20%, Making them only shields cheapens them greatly in addition to adding reusability if they get lucky and regroup near an objective. )
Troops-1x8+1x9 genestealers-405
Extended carapace
feeder tendrils
scuttlers
(Units added based on the assumption I might need them to hold a rear objective, low unit count due to need to scare opponents into moving closer to units that originally guarenteed death, and now give a 50/50 chance instead for this points level, Should either use for holding rear objectives, outflanking, or run with carnifexes to maximize to hits)
Heavy Support-3x179 Carnifex
Adrenal glands(I) 6
Adrenal glands(
ws) 4
Bonded exoskeleton(+1T) 20
Extended Carapace(+1Sv) 25
Reinforced Chitin(+1W) 15
Toxic Miasma(-1WS Opponent) 8
2x Scything Talons 8
(Originally had absolutely staggering destructive potential, now has potential to hurt a unit, Due to dropped upgrades cannot potentially wipe a squad unless squad is 5 man or seriously weakened, however, it now consistently gets 5 attacks on a charge instead of average roll of 6-7 with potential of 4-9 and later turn potential for 2 attacks per round, assault are now virtually guarenteed against 10 man squads or higher except against non assault units to last more then one round, survivability is now reduced by 40% due to inability to assuredly cripple any squad first round, however is raised by 20% due to fact that opponents burning need to shoot them and only them will undoubtebly drop when faced between them and a squad of 8 genestealers in melee. overall expect 20% performance drop.)
More bodies on the field... Its funny this was originally a 1500 list with one less carny... It got to 2000 on the thought it would be more viable... it seems that the answer shouldn't be more bodies but rather more points should be scrounged up... jeese man, unless I start really cutting into the carnies the only way to put more critters or synapse up is either non combatant warriors

or trade 4 gaunt for a stealer, when you ask for more bodies it should be more like trade for more bodies or up the list to 2500. I could do either but i've already made one new army today, so now I need to wait a bit before I spend more time making a different theme... Tell you what though, I'll break tradition with me and make a viable generic army on sunday. No more melee necrons or Wraith Eldar or other unviable-but-for-some-reason-extremely-effective-lists till after I make that one
(incidently, for the life of me, me and my local store gamers can not find a legitimate reason why an all wraithguard/wraithlord list is so effective, any ideas?

)
P.S. Yes, thats right Melee Necrons if someone asks I'll post the list, otherwise, It stays with me till it proves itself to be unviable, losing to an assault based army would be a good start, or losing to a shooty army, or for that matter losing a game at all.
(Melee Necrons current record-Speed freaks 0-3, Blood Angels 0-1, Green Tide 0-9, Mob and mixed Tyranids 0-5, more standard Necrons- tied,
CSM- 0-2, Dark Eldar Wychs 0-1, Shooty Eldar 0-1,
IG no games completed, last one ended with my entire army engaging half of his he couldn't shoot me

, Tau a close 0-1 we'll say .5-1, Demons none played, Combined Orks and tau army 0-2 was close the second time.)