I would either cut it off as originally planned or stop pinning after 12 weeks and start PCT on week 14. Then I'd use what I had left for another cycle in the future. From what I've read, depending on how much you're pinning now weekly, there's no reason to up the dosing if what you're already doing is bringing good results. More is not always better. Also, I think if you were to up your dosing, you would want to do it halfway through the cycle, not at the very end right before PCT. Just my $.02
Get some good results thus far? What else you on?