Hi, I am using the Six.One 95 2012 model. I was stringing Pacific Classic/Lux Ace at 52/48. I changed the cross to Lux 4G 1.25 and it immediately was apparent that the 4G was softer, plusher, and just made the stringbed wonderful. I have upped my tension on the crosses and now play Pacific Prime/Lux 4G at 52/50. I don't think there'd be an issue with comfort and 4G is both tensions were the same. As it is, I probably won't mess with it too much more. I really like the feel.
There is no trampoline with this. Control, touch, and power are awesome. This really is a nice setup. IMO, the tension of your crosses when using poly largely depends on the properties of the poly. If the poly is a 1st generation (read harder) you might want to consider dropping tension as it will really stiffen your stringbed. If you are playing with a newer poly (read softer) then you can up the cross tension. The benefits of this are a little more control.