Hi Brian, I have the LRIRMH i don't see much change in the main, it moves a little when it reaches 28 by about 2yrds on plus 45yrds. It's easily managed though as long as you have a thermometer on the gun and watch it when it's warm, winter was very stable didn't move at all.
I have the Johno fin and the gaps good between 50-55yrs, I usually mark it at every 2.5yrds from 20 up.
I use the sunshade which is heavy I know Chubby doesn't use one as it is weighty, maybe a print project for you :-).
Steyr LG110 FT, Sightron SIIISS 10-50x60 LRIRMH