I have used HCG throughout my last couple cycles at 400iu's 2times/wk and last time 3times/wk. For me, I didn't notice any desensitizing, and the benefits during/after pct for me were great. I think the dosing and frequency for injection is individually based, you need to expierement a little to get dialed in.
If thats you in the avatar, I think you might be able to build more mass naturally, (I woulda killed for genes like that) plus as someone who has always had low test, it is possible that you may never naturally recover to 250+ after cycle. This could lead to a severe depression after the cycle, as well as a whole lot of other problems. During my first cycle I felt aboslutely amazing, for three months I was like a different person with my attitude. I never had roid rage, just was happy and felt good all the time (laughed alot). After my PCT, I felt like shit for about 6 months. Maybe it was just a comparison to when I was on cycle, but I really felt depressed. It took awhile for my test to get back to 300, which I think might have caused that depression. Just my .02....