I’ll try to makes this a simple question…

I currently have std length Mizuno MP 18’s 4-PW with KBS C-Taper S shafts

I was thinking of soft-stepping, but not cutting down the butt (I would like to keep the .5″ increase in shaft length).  I am reading that all the head weights for the MP18 line are the same.  In theory, if I do this, I would not be changing the flex by soft stepping, I would assume only my swing weights would change and increase the length of the club by .5″?  (given that the head weights are all the same?)

Would this be a correct assumption?

Thanks in advance for any feedback.