A well performing MPR is probably going to be as good as any! I would think it would more hinge on the pellets. I would be tempted to stick with the MPR and increase it's weight. Unless that takes you into a different class of course!

What sort of groups are you getting?

Do you have several wind flags on your range?

I am interested because I shoot HFT but want to do some distance stuff. I have 50 yds and 100 yds at the club.

My s400 is sensitive to where I place the front bean bag, is your MPR?