Here is the post I mentioned previously:
In any case, I decided to experiment with different combinations of EO + oil as the primary solvent. After a lot of time, money, and painful injection sites, I finally found a recipe that works exceptionally well. I mix EO and oil in a separate vial with a ratio of 60/40 (EO/oil). I then use this mixture to dilute to volume a target concentration of 125mg/mL of test prop prepared with 2/20 BA/BB. The end result is smooth, painless, and comfortable larger CC shots. Dosing 3cc's of this preparation is far more painless and comfortable than even 1.5cc's of a 100mg/mL test prop preparation using no EO.
I suppose all the pain was worth it in the end. Running slightly more than a gram of prop per week (completely painless) is a wonderful experience.