SweetiePie: A ball with 2.5 spin as compared to one with 5.0 spin will behave much differently to the same percentage of applied spin.
Indeed :)
In fairness people probably took that as a gimme mostly, but with the OPs ? well worth pointing out.
At the OP. You still need to check any mapping people give you. If 50% is usually too long with a club then you is at a differing understanding to the original mapper - assuming said original mapper is of sound mind..........Easy stuff but some work (and yes one yardage chart per one club ball combo).
SweetiePie: One size does not fit all.
So if someone laughs just move on with head high - so to speak:)