Originally Posted by bbiker21

This is incorrect. 375mm AC length is too short a rigid for a bike originally spec'd at 130mm travel. A fork in the range of 500mm axle to crown is a better target.
Perhaps OP could try riding the 455mm fork. It seems short to me, I wouldn't go for that. But if the frame is super slack already and a short fork reduces the effective fork angle, maybe it's palatable to them at 455 AC.