I have been working through the LP for about 6 weeks now. I am having bilateral anterior shoulder pain on my bench press and right biceps area pain as well. It occurs as I move up to work sets and is a 2/10. It seems to ache more for 1-2 days after a day including benching. I have worked with an SSC in person and reviewed my videos so I don’t think there are any gross form errors.
My last bench session was:
45 5,5
60 5
75 3
90 2
101 5x3 (3 sets of 5) at an RPE of about 8
Definitely sounds like a loading and recovery issue. I tend to go conservative in these scenarios and add in tempo (3.0.3) with high volume and low intensity (3x15) then slowly inverse the two variables as weeks progress and symptoms improve.
If you are using a slow tempo, then you can let that dictate RPE and go fairly high (8+). Also, symptoms will be a part of the process which will also regulate RPE.