ArgyleScott:
percentages mean nothing. I'm sick of seeing 50% shots go farther than regular shots.
The power on the scale is not linear for clubs/irons. Example: If you have a 100yd wedge that ends at 105 with no spin, in no wind, using 100% power, that same shot, at the 50% mark will be much, much shorter, not 52.5 yds.
No club, in the highest of winds will go farther using 50% power than it would using 100% power on a similar shot.
Your caddy (or you) changed clubs maybe. Also, not sure what ball you're using, but if it's a low spin attribute (coupled with low loft/low spin clubs/irons)..you will get differing roll outs, always.