How to apply RPE to Starting strength linear progression or bodybuilding routine?

Hi guys,
i was wondering is it possible to apply RPE to SSNLP because the 5 pound increase in weight from workout to workout is really difficult for me.I’m a novice and have tried the SSNLP for three months now with bad results.My squat is stuck at 135 lb,deadlift at 225lb,bench at 155lb.These lifts are bad because i’m a 29 year old male,215 lb and 6’3".I honestly think i don’t respond well to this kind of progression,because every time i try to increase the weight i just can’t lift it,my form breaks down.So i was wondering if i can apply RPE to have better control of intensity from workout to workout.Does anyone have any idea how to do it?
Also has anyone used RPE in bodybuilding routines for hypertrophy?

In your case, I dont think your lack of success lies in the SSNLP. Make sure you do a form check for your lifts, then nutrition and recovery.

What are your eating habits like? Are you eating enough to drive gains?

Things that may or may not help___

-squat shoes (may help get to depth easier)
-valsalva (get “core” more involved)
-belt

It’s probably a form issue though…

Speaking as someone who failed as many times over many years I can say from experience form is the biggest thing . I would get a form check of all the major lifts and buy a belt . While being honest about your eating and sleeping habits to yourself