If a lifter stalls in a lift (and this always happens to the bench press and press), I offer these solutions:
• Back up three cycles and repeat.
• Back up three cycles and start pushing last set for a PR or a goal set. This doesn’t mean you go crazy on the last set and let your form go to hell. I only recommend they do this ifthere technique is sound.
• Back up three cycles and increase the volume of the supplemental work {7-10x5 @ FSL).
• Back up three cycles and perform 5x5/3/1 (see this book for explanation).
• Back up three cycles and use SSL (see this book for explanation).
I’ve only done options one and two and the only answer I can give has already been provided by Jim. If you can push rep PR’s without letting form go to shit, do that. If not, stick with your 5’s PRO.
In my limited experience (press has never been a strong lift for me), I’ve always found more volume and training more focussed on a pump in the shoulders to be what pushes my press up but YMMV.
I also don’t think my shoulders could take 7-10 sets of FSL presses, but I’ve never tried it.