As posted previously, I take an adderall every Sunday to help with law school studying. In the evening, when ready to have sex, my typically 10 EQ was dropping to about an 8. I was still able to have sex, but it wasn't hard, veiny, and mean-looking. This was a bummer, so I decided to experiment.

L-Arginine: no improvement at any dose.
Cialis: 10 EQ even at a 5mg, but I didn't want to be using these every time I took a stimulant.
Exercise: no improvement.
jelqing and Edging: small improvement, mainly unturtling my flaccid, but EQ 9.
Clamping: BINGO! 10 EQ.

I typically clamp weekdays and have sex weekends, but adding a clamping session after a stimulant got my blood flow back to normal. I've never had EQ issues after clamping, I'm always rock hard after a clamping session, so results may vary. Thanks to everyone who's been answering my questions on the forum.