Need help with tires

I know this has been done to death before, but I am about to buy new tires and have some doubts.

I would like to keep the tire height the same or very close back vrs front.

I have just installed the offset spring kit hoping to be able to run 275-60-15. Not a chance.

Then I wanted to run 255-60-15 but when measuring the tire is 27" round. I am very sure it will rub / hit up against the front/bottom of the fender.

For those who are running this tire size what other mods did you have to do to get this tire to fit? Is my only other option is to go to a 255-50-15 tire?

Any suggestions for a front tire size with either tire for the rear?
thanks