How I wish I have your design skills to liven up my own characters. Anyway here's my view on this DLC.
I predict that the Hyperion will be very hard to use. This is because its basically a multi-shot javelin, and javelin isn't the easiest thing to use in the inexperienced hand. So if people complain about one shot, imagine if they have to pull off 5 shots in quick succession.
Here's my idea of a better mechanism for Hyperion.
Fire rate: 100 (same as Valiant, 180 is ridiculous)
Capacity: 30-40 (same as Valiant)
Damage: 220-250
Weight: 2.0-1.4
Min charge time: 0 (instant fire)
Max charge time: 2 sec
Depending on the charge time, fires from 1 to 5 shots at once with a 0.1 sec interval between shots. Example if you charge it 0.5 sec then it fires 2 shots, if charge 1.5 sec then fires 4 shots, etc. Auto fires once fully charged so players cannot hold charge and fire it later.
Geth Shield seems weak when you compare to Tech Armor which is permanent and gives safeguard against gang and give a lot power or melee bonus. Just make geth shield permanent and give it a nice stagger and damage effect to enemies in front of it. Remove shield strength since its permanent. Give it a movement speed penalty and cannot roll (move it from Overclock to here). Overclock doesn't need penalty since its time based.
Pulse beam rank 6a can do better (splitting a laser attack is boring and illogical). Make it a piercing evolution that allows it to go through maximum 3 enemies behind.
Not sure what you mean by rank 5b in flashbang grenade. Enemies will reveal when they take damage. I think its better if you make it increase base grenade damage by 100% (300 is hardly much). Also the base vulnerability give it 25% rather than 7.5%. It'a a grenade power. It has to be better at debuff than proxy mine.
Phase Shift is nice.
A lot of extra programming is needed for a skill to be used on a teammate.
Cryo grenade is nice, just give it 500 base damage.
Salarian STG seems awfully overpowered with 80% DR at all times and if thats not enough DM restores shield. Just replace Reave with Biotic Rift.
Batarians NEED their blade armor, otherwise they can't tank anything and with their inability to roll they'll die. Blade Storm is a nice skill but is misplaced, and nobody will spec into it when they can just BC > Impulse repeatly.
This is just my opinion of course, you can choose not to care but all my criticisms have their reasons.