Nice little combo. I have EQ @ 500mg/ml with zero pain, but I get a lot of injection site swelling.

That's strange, my eq at 500mg/ml has zero pain and no swelling, i actually shoot it with my 500mg/ml test/cyp combo to ease the pain from that.
I Think you could have gone higher with that masteron eq combo if you wanted to, i made my masteron enan at 350mg/ml, and since eq is already an oil, i would think you might be able to pull off 350mg mast/ 500mg eq/ml. Not sure if you wanted the concentration that high, but i imagine that would be some thick stuff.

Its a painless swelling, and i gotta say it really gives my quads that extra sweep I been lookin for lol.