Also, to address the burn and pain you described.
I had pains like that in particular muscles back when I first started pinning. But it was because of virgin muscle.
As for the BB concentration, I don't beleive this would cause that as I test pinned BB strait. I pinned a 1/4 cc of pure BB once to try to see what was my bodys reaction caused by and there was no pain at all. It was the EO that was causing me inflammation. I also injected 1/4 cc of BA and I had pain but no burning!!!
Never had any burning with prop either. maybe it was a nerve, like nicked a small one or pushing in the liquid right on a nerve or something.
Prop is unmistakeable!!!!! Pumps will be amazing in at least 3 days or the shit is not great shit.
I never base gear on the amount of weight gained because most of us know that gear doesn't put weight on you.... It's the food and water things you eat and drink that put weight on you. So basing the quality of gear on weight gain is pointless. If a person is on the HIGHEST quality gear ever made and is eating like an etheopian then he will surely lose, not gain, weight!!!! And if a person just simply eats better, changes their diet, and eats a shitload more WITHOUT GEAR they will gain weight!!!!
I base gear strength and quality on the feeling in the gym, the explosive pump, the tingle, the vasodilation. Where my nose doesn't work so well, I make up for it with the "in-tune-ness" with my body. I am so in tune with my body that I can feel every slight change. LOL, like a traditional chinese Kung Fu master or Buddist Monks ability through meditation to control their heart rate and all that BS sorta!!! I can tell changes really well and gauge things pretty good!