Some men have a habit of digging their thumb into the top of their penis when they masturbate, or jelq. If that's how you currently jelq, switch to an overhanded grip so your fingers and thumb are on the underside of your penis.
"Ok" erections, 6 out of 10....again, prior medical history of some sort of health issue? That's not ok to have weak erections. Just trying to help see if there's something that needs to be looked into outside of a penis enlargement forum. It's not unusual for a heart related problem to be indicated by weak erections. Some of the issue could also potentially be mental. You could be over thinking things. Look into the DLD
Newbie routine which is conveniently a "Sticky Thread" at the top of this Newbie Forum. Relax mentally, and treat your penis a little less aggressively the next time you masturbate. You only (currently anyway) get one.