I'm new to airgun shooting and trying my hand at HFT. I saw in a recent article in Airgun Shooter that "for scope reference points to correspond with the trajectory of an 8.4 grain, .177pellet flying at 785 fps it is necessary to mount the scope 2.2 inches (57mm) above the BCL to maximise pellet trajectory with set aiming points visible in the reticle"

Assuming BCL is barrel centre line (?) my MTC Connect is set 2.0 inches above it on my AA S400. Is the 0.2 inches difference important do you think? If so how do I get the extra distance - put shims in the mounts? Grateful for any help.