OK, I've followed your advice again and settled on this build:
http://underrail.info.tm/build/?HgMDAwkDEAkAAAAAAADChkxnAAA5UhQ6T0vCoMKgwokhGT0rYlAsFCocZWYhwoTChx8oX8K3cgjio4kF4qyMCt-_Reincorporating Temporal Manipulation for Precognition means Psycho-temporal Contraction is back on the table, so sticking with Psycho-temporal Acceleration over Sprint like you suggested before seems to make sense. That allowed me to dump Agi to 3 and raise Int to 9 which, in turn, raised many of my skills above their key effective values. I dropped those skills back to their key effective values and then raised Temporal Manipulation up to an effective level of 300 for maximum Precognition, and I still have 20 free skill points left over. I'm quite happy with this.
Do you have any advice on leveling skill order/priority beyond what is required for the listed feats?
That's a very lean build. Sorry; I don't see much room to min/max it further. You've cut it down very effectively yourself.
Credit where credit is due, I did not do much except start with mindless' wonderful guide/build and tweak it slightly with Sat's build and your thorough help