Which tension should I use for gut/multi hybrid?

I was thinking of getting gut for the main strings and a multifiliment for the cross strings. I read that the main should be about two pounds tighter than the cross strings to increase the sweetspot. So I would do that if both strings were the same - both gut or both multi. But the main will be gut and the cross will be multi. And gut is supposed to loosen more than multifiliment strings (is that true?) So should I string the main (gut) strings two pounds tighter than the cross strings, say at 56/54 (main/cross), even though the main strings are gut and will loosen more than the cross strings which are multifilament strings? If the gut loosens more than the multi, then if I string the gut mains at 56 and the cross multi strings at 54, they will both be about equal tension after a while if the gut loosens more. So should I string the main gut strings extra tight, maybe at 58 instead of 56, so it will remain about two pounds tighter? By that I mean should I string at 58/54 instead of 56/54?
 
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