Well thats good to know . So in this case i'd go with Pro Supex Blue Gear mains with Gosen Sheep Crosses.
Any suggestion on tension changes? I've heard this debated a lot.
Not much of a debate. It's all a matter of personal taste. Like Jackel said, softer string in the mains will break faster, but that depends a lot on the amount of spin you hit with and how hard you hit. One of the biggest plus about poly string is the less movement of the main strings, regardless of which you put in the mains.
I've got gut in the mains now, but have played with poly in the mains. With the poly in the mains I seemed to have more life in my shots, with the gut, more control, but slightly less life. By life I mean spin, not power. But either way, there isn't much need to adjust my strings at all. Less movement means less sawing, which means longer life in the stringbed.