rear springs

How is everyone Correcting Coil Spring Arch? Or is it even necessary.

I'm replacing my rear springs with the OME heavy duty versions. Is there any preventative maintenance I should do since I'll have my rear diff hanging? Aside from changing the deteriorated bump stop bushings?

So in preparing the Tj for my trailer build and eliminate a slight sag in the a$$ end, I am looking for some rear springs. I have a 2.5'' lift currently. I will be towing about 800lbs when its all said and done. Any suggestions on springs? It's also heavily armored, is there a place I can look...