I wouldn't use HCG with your cycle/PCT. HCG is some nasty stuff. It actually raises estrogen levels and often is what CAUSES the gyno people experience from their cycle. Read this:
Did you know HCG is dangerous? - Evolutionary.org
If you've been on for 15 weeks - it is defiantly time to come off. You didn't mention dosages but most testosterone is dosed at 250mg/mL. 2mL per week = 500mg/week. That is not a cruise. That is a cycle.
The best PCT protocol you can run is the perfect PCT protocol:
The Perfect Post Cycle Therapy (PCT) - Evolutionary.org
You can order everything you need for the PCT protocol from ag-guys.com, n2bm.com and sarms1.com.