Here are a couple of recipes I had laying around and thought I'd post up. These are not my recipes, I came across them a while back somewhere.
I personally consider 5% BA to be a bit much since BA is mainly for antibacterial purposes and I don't expect to store it longer than a cycle . I would go with no more than 2% BA maybe even 1% for shot term storage.

Primobolan Enanthate Conversion Recipes

50 Ml for 200mg/ml

10 grams Primobolan E Powder (7.5ml)
1ml BA (2%)
7.5ml BB (15%)

17ml Grapeseed Oil

17ml Ethyl Oleate

25ml for 200mg/ml

5 grams Methenolone enanthate (3.75ml)
16.25 ml Grapeseed Oil
1.25ml benzyl alcohol = 5%
3.75ml benzyl benzoate = 15%