I guess you never injected quality home brewed gear or you would understand what I'm talking about.
I didn't know until not really a long time ago. So it's not like I'm calling you an idiot for not knowing.
I'll make you few examples, any properly brewed gear using quality carrier oils, a good recipe and properly sterilization procedure will allow you to inject multiple ML of high concentrated gear without feeling anything. I'm talking that the next day if you don't write down where you have injected you can't tell because you feel nothing
I have ppl pin: test C 300 - Masteron E 400 - Test D 500 - Deca 400 - NPP 200 - Tren E 250
And report all the same things: smooth as butter, can't tell where I pinned it, easily absorbed, no knots nothing to report.
Now you do bloods and I know you are quite on top of monitoring your health but there are things that can't be told from bloodwork or at least it takes a long time (in my opinion) before maybe noticing a difference.
This is hypothetical of course but Id you had the money to not care about the cost why wouldn't you try to find the best quality on everything you are injecting into your body?
I assure you almost no UGL use MCT that cost 60$ a liter or organic cold pressed castor oil or any other pharmaceutical quality grade carrier oil.
Does it make a difference? Don't know but sure as hell if money is not problem I would not even think twice to ever buy anything that is not at very high standards.
Can you find me a chinese source that produce that kind of high concentration 0 pip high quality gear?