Thymosin Alpha-1 for immune support: Bloodwork update

I just got my latest bloodwork back after 3 months on a Thymosin Alpha-1 protocol (1mg twice weekly). I started this because I was constantly catching every cold that went through my office. My white blood cell count, which was consistently on the lower end of the reference range, has moved into the optimal middle range. More importantly, I haven't been sick once since starting in January. My doctor is happy with the progress, but I'm wondering if anyone has experience with long-term maintenance dosing? I don't want to stay on a high dose indefinitely if I can achieve the same immune modulation with a lower frequency. Has anyone successfully transitioned to a 'pulse' protocol after initial stabilization?