Well - I gave poly/gut a whirl. Used bhb7... And started to really shred the gut in an hour - not broken yet, but nearly there. Some deep notches and fraying and had to sort straightening the strings in 30 mins.
The spin was good, very good and the gut feel was still there albeit much less than with gut/poly.
I think I will give it another go with 4g ; should be a little less harsh on the gut crosses.