The VR "jumping Orky" should be nerfed with the additional phase slot upgrade as suggested. That alone will still make it useful without being quite so OP. Additional adjustments may be needed but should start with that. Anyone suggesting the Orky should use fleet supply will get burned...
I think Coronata titan should be "faster" with a better turn rate than it currently has as a possible buff. Its got like 8 damn engines on the back (multi directional, compared to the Eradicas 2 of approx the same size). Making it the "quick strike" titan may be all it needs and will also help with the rather limited range of its "insert name" laser of doom (increase titan turn rate/speed and you negate the "need" to change its primary weapon stats). Obviously, this will help its survivability as it can run away more easily as needed.
VL titan....add phase missles.....!!! But speaking of "engines", the VL titan has an "exhaust" coming out of its ass from no discernable port...just looks weird. would like that either removed or an actual port for the exhaust added, but this is way minor. +1 to suggestion of increased turn rate for short period after micro phase jump. Maw should have limit on how many ships it destroys (I literally sucked in like 250 pirate ships after they phase jumped right infront of me...seems way OP)...after that limit it should only do massive damage to frigates. Maw ability should have some affect to cap ships (dunno what tho...suggestions?) Spawn phase stabilizer cooldown should not be changed IMO, but make the spawned phase stabilizer not use tac slots. If I can place it in a grav well with no tac slots even available, it should not use tac slots in one that does. With the extremely high cooldown, this keeps this from being "abused".
Corvettes...this is a tough one. OP in the early game, nearly useless except as cannon fodder in the mid-late game. Corvettes should be strong against SC, strong against frigates only in greater numbers (2/3 to 1) and nearly useless to anything larger unless in overwhelming numbers. Also, why do none of the cap ships have flak (except specials like the Kol). Using the TEC as an example, if the Garda has 4 flak turrets, each cap ship should have at least 1(some of the more defensive/utility cap ships should maybe have 2) while starbases have at least 2). This should solve SC/Corvette spam at least in the early mid-game and later while not completely destroying their viability. Also in the same grain, Harnger defense platforms should ALL have their SC squads increased by 2 and either A: be more expensive and/or B: by additional research for all factions (not just the Advent, which would keep their 1 additional SC squad-per-hanger advantage). This would also assist with SC/Corvette rushing/spam.
Wail should set to a max damage limit per pop per neighboring grav well instead of causing damage to every ship at 20 per pop per neighboring grav well. This means it would wipe out only small fleets, and reduce the numbers greatly of larger fleets while not completely annihilating them. Player should not lose control of planet for this but should bring pop down to 0 (or 1 if needed to keep control of planet). Cooldown shouldn't be needed since it would take enough time to bring pop back up to use it.
I have never had a problem with taking out a Corsev (not more so than any other cap ship anyways). Its already ugly enough so I am not in support of nerfing it at all at this time. If it wasn't for its capture ability I would never use the damned thing.
Eradica (AR titan), Chaotic burst may need a slight...and I do mean bare minimal, nerf. I never use unyielding will because I'm not letting you destory my titan in the first place. So I skip that upgrade for the Antimatter/cooldown upgrades (which I don't use for the other titans). I don't think that Titans should retain their full level if destroyed either...maybe -1 level when killed but in certain scenarios it really sucks to know you just threw everything you had at a near-indestructible level 6+ titan (looking at you VR) just to know you are going to have to do it...again...soon.