...or intensity, or adjust calories/protein, or sleep.
Everyone is going to have individual needs based on their specific and individual responses. These responses can change throughout the year due to other physical and mental stressors. patient small adjustments over weeks and a log book will give you great understanding of how your body feels and adapts to these changes. You can really dial yourself in over time and your lob book will always be there to help you fix a self imposed training limit.
The strength adaptation between a top set @ rpe7 and rep8 is near zero. Both should be sufficiently hard enough that your splitting hairs adaptation wise. If you introduce RPE to a novice and manage it at some point they are going to have a strong enough grasp the "feelings" aren't going to determine training success. Where the rubber meets the road is back off sets. This is your heavy volume and in an auto regulation program it's a percentage of the top set. If you a little off on your top set you're going to be that much more off on your volume sets.....but that's what coaches are for.
One tool you could use is a bar speed indicator.
Bar speed trackers are quickly becoming common in the weight room. Which ones work, which are just hype, and what can you expect to gain from these tools?
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Bar speed is a very good indicator of intensity. I've never used one and don't know that how useful they would be, but it's certainly a feedback tool that gives you something to compare your current bar speed to your baseline.
The RP guys are as good as it gets.....but if they still offer it I would buy a coaching package that lets you check in with video's of your lifts from time to time. A good coach will get your auto regulation baselines and re-baselined in a single video.