Warp Talons...you do realize that when one makes a chart of good and bad units,
WT are #1 on the bad side (actually more like #3 behind spawns and possessed). I mean, look at it. its 300+ points for either a bullet filled jump-slog (with no transport mind you) or a danger filled deep-strike. They act like vanguard with none of the options. Instead of a deep-striking assault, units within 6" can't shoot (or fire snap shots, I'm not sure). Drop, and invest in more Zerkers or another Helldrake.
Land Raider is an instant shoot me sign. Put Kharns squad in a rhino with the other rhinos giving it cover. Sure, you can't assault, but if you play your cards right the enemy should have to deal with 40 zerkers behind rhinos ready to assualt. Invest the points in some defensive units such as cultists on objectives or oblits/preds/maulerfiends/havocs/anything with a big gun. Sure, they aren't the most useful khorne units, but never underestimate a deep striking oblit, it causes carnage.
Other suggestions:
Drop ax on
DP, it can kill enough on its own. better maintain that high
WS (at least, thats just me)
Bikes have been hailed as ridiculously good for their points (just think about what would have happened if bikes could be unlocked as troops). A squad with melta or plasma guns can cause carnage
consider bringing zerker squads to 10 in all but khans, like you said, you can't have the cake and eat it
Ally some bloodletters and a blood thirster, or maybe some renegade guard. When a foe is assaulted on all sides, he's more likely to make a mistake
overall, a mono god list will never be top tier, theres a lack of good ++, shooting and psykers, 3 main elements of the game. Keep that in mind when playing competitively. Other wise good luck
Response to Above (Because he finished typing before me

):
-
LC will reduce your attacks by one, I'd rather have the extra attack
imho -Problem is, 3-4 WON'T get in, no
MoT or
MoN means they die, like almost instantaneously, 5++ isn't good enough for what you pay
-You need anti-flyer, unless a S7 VS will clear the sky (most likely, it won't)