I love these shafts also. You didn't say what shafts you are shooting now. I am shooing similar to what you are shooting now,at least on the 60 lbs bow. I am shooting 150 grain at 32" long. That would not qualify for the heavy head,but you could try the other shafts. I've also shot the 250's and they would not go as heavy heads in that category. I think I shot a 175 or around 200 grain head with that shaft and that weight. I'm no expert,but you might have to go with the 350's with a 68 lbs bow and heavy head. I've never had any luck with trying to match a head to a shaft. I've always tried to get close on spine and then give it what head it liked,but that's just me. Good luck!