Basically, I think adding a confirmation to Average Grades would be nice. Like how you have to confirm when selling items from hoard "are you sure you wanna sell this?" but like, showing you a small blurb on what you'll get from the averaging IE:

"Result: Liquid Pearl (x22) Grade: 87" or the like. As it is you just kinda have to break out a calculator every time you want to average stuff and it's still relatively easy to screw up, in my experience at least. The amount of times I've ended up with g99 stuff because I was slightly off or misclicked is just painful.