Hi there. I have a great deal of successful games (4:0 win:lose on vassal with bikes

). I will say, however you run them, they ARE a steep learning curve and the second you lose your 'winning' attidude, the game starts to fall away. My victories have been victories, but narrowly (beat tau on objectives with 4 bikes left

)
To your list:
Captains are a need. In your
OP, you have exactly the same loadout as me. At 1000 points, you cannot afford to go super expensive with
PF+
LC. Dont worry about conter-terminators, this is 1k points and a terminator unit is 1 5th of the total, you'll be able to kill them with massed shooting
plas. The relic blade is good because you keep your I5 - 1 higher fighting
MEQ, and it's AP3, so you can deal with them effectively. Dont buy a stormshield. Points are tight enough in a 1k list, and to have your invuln save go from 4++ to 3++ is just not worth it
IMO. Relic Blade, Artificer Armour and Bike - the minimal wargear for a bike captain (
IMO)
Bikes dont do well in combat (unless they charge and outnumber a squad 2:1). Replace those Meltas with plasma. Longer range means enemies cant charge you after you drive up close.
Plas got a boost too, so your AP2 gives +1 on the vehicle
dmg chart - so it's still decent for vehicles. Attack bikes should have a
MM. The attack bikes are the core of your anti-tank capabilities, you need them. I like what you have done with the full bike squads in order to combat squad. I do this is larger lists, but people seem to think its not good. I dont quite think you need it in a 1k list. 3 Min bike squads with
plas and
MM is good enough (
imo) - add more bikes if you have left over points. On my sargents, i have Power fists, If you are looking to take out a tank and your
MM whifs, you have the option to charge it and punch it to death. Of course, meltabombs do this just as good, but i have a
PF to give my
CC a kick. Meltabombs are a must at the very least, the
CC weapon is up to you. Combi-weapons are not worth it,
imo, you have 2
plas already and 1
MM, you dont need anymore.
Your stormtalons fit well with the theme, why not Skyhammer Missiles? 1 more shot, for the same cost. I would argue that you only really need 1 Stormtalon
atm. Due to the lack of skyfire, 2 might be a bit overkill, but
YMMV. I also found that the twin linked assault cannon's rending does the majority of the damage
If you ever want to test a list,
PM me and we can sort a vassal game out. I'll be quite willing to help you with tactics etc.
And in my sig is my army list, have a peak for some inspiration
Good Luck!