I'm taking it the Razor was First Focal Plane?
Is your new tacticool scope also FFP?
If it's a second focal plane, the paperwork with the scope will tell you what magnification to use for the subtensions to match up.
Also note that some SFP scopes will have a POI shift if not at the proper power setting.
I've tried lapping Warne rings before. Found after 2 strokes that i didn't need to lap them.
I agree I would not bother to lap the Warne rings now.