Where to start?
Start at the beginning, go on till the end then stop.
Ok! In the beginning there was a farseer with no weapons and no transport...
Enough of this nonsense!
Lose the wraithguard. They are overpriced and slow.
Give the Farseer some weapons(singing spear or witchblade/shuripistol)He rides with the Banshees
Get another Farseer with fortune a jetbike and singing spear. He turbo boosts to be with the Scorpions
Fill the Waveserpent.
Max the Scorpions.
Pick either the Warpspiders or Swooping hawks and Max them. Lose the other. Consensus of opinion here is that Spiders are better.
Don't put a bright lance on the Falcon.(If you have to choose between firing the pulse or the lance the pulse is almost always better. For when its not you have Firedragons with Fusion guns and meltabombs)
Lose the CTM on your vehicles but give them Spiritstones. (who cares if the enemy shoots your Falcon, It is unlikely to die. After your Waveserpent has delivered your Banshees it has done its job and isn't likely to be seen as a target anymore)
I don't like EMLs(Don't ask me why, its a fine weapon, I just don't)
I haven't priced any of this so it may not be possible and it reduces your number of units on the table a lot so you may not like it. But if you need more units you have 3 elites slots you could fill with min sized Defender weapon platform squads.These are unlikely to be perceived as a threat as most enemies are going to be more worried by the big squads of close combat superheroes about to knock his troops into the middle of next week.