Last time Tender Quick + 6.5 hours gave me a 1/4 inch ring. Tony (DM) also did either 6 or 7 hours and also reported a 1/4 inch ring. I agree that 1/4 inch is a little larger than what I'm going for, so I'm going to go 3-4 hours next time. I think the issue for you was that the cure had a chance to penetrate further overnight, even though you rinsed it off after an hour.
If you TQ or 20-30 minutes, rinse, rub, and smoke, you won't get anything. I would suggest for your next brisket, to TQ for 3-4 hours, rinse, rub, smoke. Just don't have too much time between the TQ and the smoke, or the ring will expand.