If you notice I used a 3% BA and 3% BB formula you cann play with your own...just use a steroid powder calculator
http://www..com/steroid-powder-calculator.html
I personally believe the less solvent you use the better. There is no way around the BA, you need it as a bacteriostatic agent, but the BB mainly helps to hold the hormone in solution. With test prop I have had no problems gettting it to hold at 100mg/ml with 3%, if that doesnt hold for you, you can alwyas increase the amount. I have read a ton and really do feel that the increased solvent levels can cause a lot of problems, but hey everyone has their prefences.
Rub a little BA or BB on your fingers then touch your lips, it burn and numbs....now imagine a large quantity injected? In the end you have to find your sweet spot on your own formula via trial and error. 15% BB for me, which is pretty standard, caused a ton of flu symptoms. I literally was waking up with diahrea and feeling major flu symptoms.
Everyone will be different but its fun mixing it up and figuring it out.
Good Luck!