Thank youSRS makes a great product.
I have mounted theirs and other ARCA and PIC rails on carbon stocks but not on the ph2. I have found external ARCA to be annoying but tolerable, and I keep it to within 3" of the front action screw. I have found external PIC to be intolerable in its snagginess, So I now only run PIC which is recessed via scalloping or some other design solution.
I would leave your ph2 alone, and make the decision to be a "bag hunter." Take the bipod weight and put it into one of @hereinaz excellent bags, then get proficient with shooting off tripod tables, downed trees, rocks, and the like using your new best friend - the bag.
-J