Jokes aside, there's still some talks regarding kicking those cells up to 90% on generic IDs, we'll see how that goes. As things currently are though, it's the general "formula" applied to the current chart - House corps at 100%, house police at 100%, other house factions at 90% and any outsider at 75%.
As for the Zoner, GMG and IMG techs being moved down to 75%, it had nothing to do with the new house civilian guns. Was simply a necessary change balance-wise.
P.S: If you consider 75% core with a super efficient gun "completely worthless", I suggest you work on your core management a bit. Even 56% with the right loadout can be somewhat handled on a fighter.