Its going to go fast in the 320. I wouldnt do it. Of course. I love Gut/Poly and play rather well with it, so I don't blame you.
I have the same issue with my yonex. I am figuring out what the best string setup is still, but retrying G/P just to see how it goes again. Problem is that it is very similar to the 320 in terms of the open pattern.
So you may have to decide if you love the string setup more than the racquet. If you love the strings more, you would probably be better suited with the 305 (maybe the most slept on stick that is considered "new") or the 325, since they have tighter patterns and will preserve your strings.