275/60/15 sidewall clearance to leaf spring clamps- suggestions?

Oops, That's why pretty much everyone on the planet runs 255's. I doubt very much if very many of us could tell you are running 275's. Not up close and damn sure not while you are driving by at 25. Sorry, No quick fix.
Yeah I might just do the simpler fix and buy 2- 255’s and call it day vs all the other hoopla and extra work. My current tires still have sticker marks on tread and never cleaned white letters so basically new