Brush width and size varying drastically

I'm using AI on an iPad 12.9" Pro, (5th Generation), OS 17.1.2 with an Apple Pencil Gen 2
my issue is I'm using the paint brush tool and my results from the brush are varying drastically. I have been experimenting with a few different brushes. Mostly, but not all custom brushes. Using the brush with basically the same exact technique, pressure, motion, etc etc. the brush is much thicker or much thinner. It's really screwing up the drawing and slowing me down a lot. How do I fix this? The example in the image attached, is an example where it was actually much less severe than many other times it has happened since I started trying to work on AI for iPad.