I've messed around and blended different ester gear like test/deca and test/EQ (tried both cyp and enan) at 250/250mg per ml and that **** hurt. Not during injection, but the next day. It also left a hard knot at the injection site for about a week. Since then, i prefer to make them separately and draw into the syringe together. It may have twice the volume, but no pain. I also made some tren/prop for a buddy and he complained about the pain also. I always use 3-5% BA and 10-15%BB for all my experiments.