Woah buddy, how long have you been training? Whats your diet look like? I dont mean to offend anyone when I say this but I do not believe in hardgainers, at all. Obviously your body metabolizes energy very fast, and as much as it sounds like a broken record, you need to eat MORE! And if you're worried about losing gains then maybe you should try and make more progress naturally because if you don't take in enough calories YOU WILL LOSE YOUR GAINS. Simple as that. Not trying to be a d1ck about this brotha, I am just giving you my honest opinion. You just need to eat like it's your job.
Now with that said...
When it comes to the GHRP, -2> -6. This is because there is a smaller spike in cortisol and prolactin. Both are sides you want to limit. I personally like 200mcg GHRP 2 mixed with 100mcg CJC 1295 dosed 3 times a day. That makes for 2.1mg of cjc and 4.2g ghrp per week. Takes about 3-4 weeks to really start noticing results. But the key is the timing. For example, you dont want to do it on a completely empty stomach, but you also don't want to do it within an hour of eating. Fats and carbs will blunt the effects of GH, so wait at least 30-45 minutes before consuming either. Protein is fine, like a whey isolate shake or some lean meat. Protein does not hinder the effect of GH, so if you get hunger pains protein is what you should consume.
GHRP will give you slight hunger, -2 less than -6. CJC gives you some what of a headrush that lasts 15-30 minutes. I like 1 dose in the morning, 1 mid day, and 1 before I go to sleep. One thing that I can say is that my recovery skyrockets when I use GHRP/CJC. One or the other is a waste IMO if you don't stack them.