David;
Kelly Petersen still has his spine charts active on the web, and for aluminum your setup shows a 2020 shaft. Also if you're shooting Dacron try some of the new B55 in an endless loop string. On my hunting recurves I normally shoot flemish B50 because I value a quiet shooting rig above all other features. I had Mike Steliga of Bruin Bows make some B55 endless loop strings for me and found I had to move up to the same spine arrows I use for my FF strings. Speed is also very close. Only diff is the B55 is so much quieter than FF. I went with Mike just because he's close, but Chad from LBR offers these also.
Dave