I recently finished barreling my new Three-60 action/30 MOA rail, with a Krieger sendero contour bbl blank, and installed the same Athlon Cronus as you're using, going with Athlon Precision medium height rings, which are listed on their website as having 1.069" height. Their low 34s have a listed height of .944", or 1/8" lower. Judging by setting a digital caliper at .125", and looking at it from the side of my rifle, it appears that the low rings would still allow the objective bell to clear the bbl - but just barely. Since I put the Three-60 into a Manners PRS1T stock with adjustable cheekpiece, there was no reason for me to go with the lower rings. I have used these 30 & 34mm Precision rings on three rifles, and like them just fine.