Stat question --- Won $ wsf %

[Vinny80]

I was watching a Brian Townsed vid on cardrunners and when he was checking his pt stats after, he said that your "won money when saw flop %" should be at about 50% (that's what he had for his session and said he was usually running around this number). I've checked mine for my last 200k hands and it's about 41% with a decent, but not great, 3.5 PTBB. For comparaison purpose, my AF is 3.59, went to SD 23.8 and won at SD 52.5.

Basically, I'd like to know what you guys have for this specific stats (also what you think about it in general)and if you believe this could be a leak in my play I should be working on.

Thanks!