You can use 200mg/ml with test cyp and the eo will not be necessary. Maybe you arn't one of the guys who reacts to eo, but if you are, you will have 50ml of test that you will suffer through. I can't use it. I get too much swelling at the injection site.
Start with 15% bb to dissolve your raw and slowly add bb until it is dissolved. You can use low heat to help dissolve the cyp.You will not need more than 18-20% max. If you do use any heat, let the solution cool to room temp to see if it crashes before you add your carrier.