Before you even consider anything, I would get blood work and speak with your doctor about this genetic predispositions with gyno, there may be something else going on with a deeper underling issue that could be very detrimental to your overall health.
If you already have a physical aliment with gyno, why even consider "risk vs reward"?
Per you question: I would scrap the sust, way to much firing going on with that multi ester test, it could directly or indirectly cause issues or unwanted signalling between cellular groups inducing your already existing condition..I would look into a longer/heavier esterfied testosterone such as Test Enath, more stable once it reaches the blood medium, and your serum levels will not have as many dips and spikes as it would with it's counter part "sust"..
I would suggest 250mgs of Test E, and see how your body reacts/responds at this dosage first before taking this "worried ego plunge" with any other amounts..You need to see how you respond and how much reaction you get with the aromatase enzyme that you may already posses due to genetics (in this instance it could be in way of conversion of natural levels,high SHBG or even pituitary related issues and the exogenous hormones/testosterone could escalate and spiral out of control ).. Take this time to learn and listen to the curves and how you respond to a specific dosage..
Test Enath would be my suggestion at 250mg/mL E6D..