yep absolutely this. Higher concentrations almost always give pip. It’s about the balance of how much oil you want to pin vs amount of pip.
normally a UGL will only brew that concentration for people who are pinning high doses and the amount of oil gets crazy (for example at 200mg/ml if you want to run 1.5g test a week your sticking 7.5ml oil, over the typical 2x week that’s 3.75ml a pin. A lot for the muscle to take. That’s before you add another 2-3ml per pin for Deca or primo or mast etc)
so yeah, I’d absolutely suggest the amount of solvent is the issue but you obviously have to keep an eye on it, mark the edge of any redness if there is an inflamed area so you can see if it’s growing or not, see if it’s hot to the touch and if you feel a fever then straight to the er etc. Doesn’t sound like an infection but always safe than sorry brother