Corrupt Intervention and Ruin regression
Should be baseline, the only difference in the Hex and normal gameplay is that the Hex does it automatically and a generator doesn't need to be damaged.
Corrupt becomes a 'slow start' mechanic that prevents survivors from getting 3 free gens while a killer is still looking around.
Higher regression allows for more back and forth between killer and survivor, gen speeds no longer a problem anymore and they weren't made just flat out longer for more boring M1 gameplay. And killers aren't forced to run 4 regression/gen defense perks to do anything worthwhile.
Edit to clarify: I'm only suggesting that base regression be the same as Ruin, Ruin as a hex would still be needed to make generators *automatically regress*