I have some gripes about some things here:
Cloak should really be a separate armor, not an add-on upgrade to anything & everything.
Surge was somewhat broken, but nerfing the lasgun doesn't quite make up for it, as this screws over the people who use lasgun without surge. Make it 1.5x instead of 2x.
Make a healing gun separate from a ckit, with some extra feature.
Drill AND Infection on the adv dretch? Pick one or the other, kinda gimmicky.
Advanced Tyrants can do unlimited acid blob runs between their booster and the human base, two of them can level it easily. In fact, an alien grenade of that strength should definitely be once-only. The fact that it costs 6 to upgrade only restricts it to the kill-whores, who can easily hold on to it long enough to pay for itself.