i'm lost on this subject as well. honestly i haven't gotten fitted, so maybe that's the problem, but...my current set of cg4 has the tt action light

shafts in them. the other day, however, i went to my local shop and was messing around with different irons of the demo bags. all of them were stiff, and according to the monitor, my flight was better than with my regular set

. i haven't brought my set in to do a comparison yet, so i can't be certain of anything at this time

. if anyone can shed some light on this for me, that would be great...thanks.