NXT Duo II Hybrid Stringing Tension?

[Chuckie]

I'm looking to string NXT Duo II hybrid with the Luxilion Adrenaline in the mains and the NXT in the crosses on my Youtek Radical MP which has a 18x20 string pattern and a recommended stringing tension of 48-57 lbs. So I was wondering what tension I should string my mains and crosses as I have heard that the cross should be 4lbs higher than the mains and some have stringed them at the same tension. Thanks!