I'm not a programmer for TAP, but 3/60 is too stiff for that set up. 3/49's may be stiff with 100 grain heads. I'm not going to argue that TAP isn't a useful program, but the information I have is from Easton's charts which tend to recommend stiffer than what is usually needed and from personal experience. I am using 3/49 ACCs at 27" and 65 lb. DW with a 125 grain head and they are perfectly spined for my set up. I honestly believe that going with a 3/60 would be a mistake. I think you should follow your initial thought and by a couple of each and test it for yourself. Then you'll know what's right for your set up. Good luck.