I know how you feel about gut/poly strings. I personally like gut/poky strings at low tension and want to try higher one.The problem for me as I went higher in tension the strings snapped faster. It strings up fine, but 60 lbs would get me 4 weeks of play where as 65-66 lbs I would get one week before breaking. But, it could be a grommet issue so ill report back.
Tried out gut/poly again, just blah. Doesn't give me more spin or control, less feel too. Poly just makes everything bad. I'm testing out Luxilon NG 1.30 / YPTP 1.25 and it's just horrible. I don't have any extra spin or control. I'm awaiting my grommets and will be back to full bed Lux NG at 64 lbs
My stringer strung Yonex 89 with Luxilon 1.30mm at 70lbs without any problem but he did say the strings stretched thinly but still pose no problem anyway. I will try KLIP Armour Pro 15L at mains and 16 at crosses, both will be strung at 65lbs.
My current personal preference of hybrid strings: Mains: 1.30mm Gut at 52lbs and crosses: either Timo 18 or Big Banger Ace 18 at 40lbs to 48lbs. This is for Fischer Vacuum Pro 90. Now want to try higher tension.