Hemsky8321 I use HOF shafts in all my drivers, and now my FW clubs. None better. (I'll say that even though me and Rob just had the major 'falling out'.)
I've used them since their beginning around '06, when they were made in Taiwan. In '07 they went to Matrix and the rest is history. They are now made by L A Golf, which used to be Matrix, and the maker of all of Bryson's shafts. Their dominance in Long Drive is unequaled.
The shafts do not have stiff tips, but are 'firm'= stable. They keep balls on line of flight better than any I've used. I'm using 59 gr., Sr. flex, in drivers @ 47", with heads weighing 205gr.; I use R in my FW clubs. Not sure what my SS is, but I never worry where the ball is going, and that means "stable", in my book. Very stable, in fact, considering those lengths/weights. And, they do not cause ballooning, for me anyway.
230-240 CPM=Sr.
241-250 CPM=R
251-260 CPM=S
261-270 CPM=XS
271+ CPM=....you gotta be shittin' me SS!!
My grandson uses R, sometimes S,(46" and under driver), and his SS is well above yours, but he has a very smooth swing. Choose correctly. 😉