Hi,
If it were mine, I'd first check the gun (or have it checked by a competent gunsmith) for a tight lockup. If there's no rattle that didn't come from the factory anywhere, have the headspace checked. Chances are if the gun locks up tightly, it's good. Have the chambers mic'd and the gun given a real good look over. If all checks out, just keep shooting it!
The lever to the right is a common "armchair check" because so many double guns, both SxS and O/U, were built in such a way as to be somewhat self-compensating for wear. It's been that way for a long time: my 1930 L.C. Smith is still tight as can be, though the lever's pretty close to center. I guess that's not bad after almost 90 years. My Brownings, dating back to 1973, haven't shown any obvious movement in up to 100k+ rounds on one Citori (someone else will have to check in for me when they reach 90!) So the various designs seem to work. Unfortunately, when Ruger got started with the Red Label, they seemed to ignore the fact some companies had been building O/Us for decades, and didn't borrow as many of their good ideas as many of us thought they should have. This seems to be one of them.
A really good shotgun-smith can do miracles with a torch when it comes to building up worn areas. My old boss did a lot of work on Perazzis, famous for premature wear in the early days, building up, refitting and hard facing the problem areas. Once he got a hold of them, they quit wearing for practical purposes! Hopefully you have someone with similar skills in your neighborhood if you ever need them.
Rick C