Caiati, so do you lap your rings also?
I have lapped rings in the past but with the one piece base being bedded and straight I didn't feel I needed to especially with the NF rings. I don't expect I'll have anything shift with my setup. When I use a two piece base, I will lap them to make sure I'm getting 80%-90%. I haven't ever had any issues with NF rings/base combo as long as it's bedded to the receiver.