Nice setup!
I can see my scope mounted bubble levels with the gun shouldered. Just before breaking a shot I check to make sure that the fawns aren't near the shooting lane, confirm that the bubble is centered, and let fly.
My bottle guns with high mounted top-heavy optics are prone to canting on the rest so I'm careful to watch where the bubble is. I can see - real quick - on the group if I forgot to check bubble.
I just came in from shooting and baby sitting... the local doe (Molly) left me to watch over the fawns while she went off somewhere. Mid-afternoon is quiet time for the fawns and they were bedded down a couple of feet from the bench watching me so I could concentrate and not canting the PCP.
Cheers!