Originally Posted by
perman
You're overthinking it. The goal every week is to make a PR on your E1RM (estimated 1RM from a table), which when the rep range stays the same simply means at least one set is above earlier work, while for new rep ranges, your weight choice reflects the E1RM going up. While having such a goal for a day, let's say a 5@8 squat at 360 lbs, you then do a 5 at 90 and 95% of that and note the RPE. If that is 5@6ish and 5@7ish, you attempt the 360. If instead 340 (~95%) was @8, then you just stay there and try to increase next week. This divorces you from the responsibility of grinding through some horrible 5x5 one day, while leaving you fresh to destroy it the next time that 5x360 suddenly is a @7.5 and you can accumulate that good volume. If you're actually afraid of being soft on yourself with RPE, that indicates a mind that wouldn't accept mind tricks for long anyways.
Progress over time is the metric, not how accurate your RPE is. Your RPE does not have to be super-accurate to accomplish that, it just has to be more accurate than some percentage and/or estimated progress based on earlier performance.