Nobody:
Since you are experiencing harder, stronger erections, then you probably aren't overtraining.
You mention that you haven't gained any length, what about girth?
A lot of beginners who "stepped it up" in the beginning and couldn't gain length--as you have--found that after they took a 1 month break they gained when they came back with this routine:
http://www.pegym.com/forums/pe-forum...t-growing.html
You may want to try it out. It's worth a shot.