Npro Open hybrid tension?

[Robbie54B]

I have 2 Npro Open rackets, one strung with wilson sensation at 58lbs and the other with Alu power at 56lbs. Im looking to get both rackets restrung but with a hybrid of both strings, with a different mains/crosses combination for both to see which I prefer.
I was thinking of getting both combinations strung at 58lbs, but from what I have read on these forums is it better to string the mains or crosses at a slightly higher tension?
Whats the best hybrid tensions for this type of racket? I play 4 times a week so which tensions will last the best with this hybrid?
Any suggestions please.

 

[JetFlyr]

I like poly in the mains at 54 pounds, and Gosen OG Micro 17g in the crosses at 57 pounds in my nPro Open. I've played with several different polys. I like Alu Rough, but Pro Supex Big Ace 17g is my new, cheaper alternative.