I can relate to how this works because one day I was messing around with a speed stick and did two swing.
ONe was a full out swing where I got 139
the other was a swing where i put myself in the nine oclock position, held that position for a couple seconds, then fired from there.
and the big difference between the two, 4 mph
But did you stop at Follow Through (both arms straight), or did you go all the way to the Finish with the Finish Swivel?