I believe it should.  I'm not sure exactly where Deere falls within classes.    A 480 was considered a class 7 at the time, and a 670 is a class 7 and I think a 9750 is also, but the 480 is a heck of a lot more combine then either of the other two.   

I think the rotor design in the AGCO is less then optimum for tough conditions.   In good conditions it can be too aggressive, and in tough conditions it just has an incredible appetite for horsepower.  I have never had any problem getting complete threshing, in fact the problem is to keep from overthreshing.  I think something to get the material through faster would be an improvement.  Getting rid of the reverse bars, for starters, but then I think something like a specialty rotor (Kuchar) could improve performance.  The Bison rotor even looks interesting...but it is "different" enough that I would like to see someone else running one.  For that matter, I think the specialty rotor would be an improvement in an STS, too.  At least it would not be so prone to damage.  

Neighbor has a 9895 and reports that wet/drizzle conditions do not bother it at all...but he has a 20' corn head on a class 8 where I have a 30' corn head on a class 7...if  I slow down to a comparably feed rate to what he can achieve relative to combine capacity, I don't have any power issues, either.