I made a video going over one main idea to more effectively rate your RPE. You can watch the video on YouTube or IGTV at the following links.
I use Coach Joe’s squat as an example because he has a portion of his ROM where there’s a considerable slowdown compared to the rest of the ROM. If this also occurs for you in one of your lifts, then you may fall into the same trap of picking too low of an RPE and overshooting.