I'm getting ready to mount my NF 5.5X22 on a 280 AI. I have a few questions? 1. Do you guys recommend putting lock-tight on the inside of the NF rings? 2. How tight do I tighten up the NF rings? 3. I have a level + a ACI indicator on the rear top ring but am wondering how to get the crosshairs perfectly vertical? Thanks in advance!