Nice shooting!!

Since you have it mounted and it's shooting good, don't worry about the rings, if there's any damage, it's done, right now whatcha don't know isn't gonna hurt ya, at least until you dismount it anyway!!

My first choice in rings are
Burris Signature Zee, the polymer insert prevents damage to the scope and requires no lapping for 100% scope to ring contact. The only problem I have with them is they don't come in low, just medium and higher. The next ring of choice is Leupold PRW or QRW, they should be lapped also, but require very little lapping in my experience. I'm not a fan of Millet Angle-Locs, if there ever was a ring that made it easy to damage a scope tube, that's it. When used with an alignment tool and lapped before mounting, they're probably just fine tho.
Another ring that's inexpensive that works good and is readily available is the Leupold Rifleman Detachable ring, it's available in low and while not real attractive, provides a good wide mounting surface and are easily lapped.
Dunno what GS rings you have, but current production shown on their website is the same style as the pic I posted, they have just one screw.
http://www.weaver-mounts.com/products/grandSlam.aspxTim
http://www.centerfirecentral.com/lapping.html