I have the Zipp 303S - 23mm int, hookless - with 28mm Pro One Addix @+/-60psi. I guess that I can't say that you'll feel zero spring, but I can say that nothing sketchy or untoward has called attention to itself. A quick search says you'd have another 20psi to play with on the Enve, which seems to have a max of 80psi (Zipp states a max recommended in the low 70s for my 303S, but I haven't felt the need). I'm at 185-ish lbs and can put a fair amount of torque on the pedals.