Ilovemtl,
First, welcome to the GYM
Second, you're question is one that has been around for ages. There are two sides to every story, especially this one.
It has been my expierience that ejaculating after PE can have a negative side-effect. I always feel disapointed with my workouts after I ejaculate. In particular, my penis curls up and it isn't as elongnated as it would be after a non-ejaculation workout.
The results from the PE survey striked me as interesting, too.
I hope this helps. Instead of ejaculating after a PE session, I try ballooning, which is a penis workout all in itself. I also feel much better (energetically) when I don't ejaculate.
Also, don't worry . . . 6 inches isn't a bad size at all! In fact, it's right around average (Perhaps even a bit more).