I believe Dev is trying to incorporate as much of TDM as possible, and adjusting the AIs a bit so they research up to the new max tech levels.
BTW: I just discovered a wee little but with the Crossover techs I supplied.
Bio-Crystal Armor: Num tech requirements should be 2. Right now it is ignoring the crystalline requirement.
Psychic Armor: Num tech requirements should be two also. Same reason, but Psychic.
SE4 didn't give me an error about having more requirements than I said I had, it just ignored the rest.
You may want to add more to the organic and mineral costs of the psychic and biocrystal armors, respectively.
Beware the bio-crystal! The crystalline shield regen keeps you from taking too much damage while the armor heals
.
I may upgrade the Psychic armor to get a weak, range 1 psychic attack, for balance.