Sust was designed for trt but with bad logic. The thought was the short esters like prop and iso would kick in while you are waiting for the longer esters to kick in. That's great for the first two weeks but then the long esters are working and your still spiking your blood with short esters. Sust is great for cycles. Typically the longer the ester the better for trt. Cyp is common but decaonate or undecanoate would be ideal considering your on for life. 200mg of test decanoate ever week in a single shot will lead to perfectly stable levels and no sides. It'll take 3-4 weeks to ramp up but in the grand scheme of things that doesn't matter. If you're really concerned you can blend it in yourself for the first month
Week 1 150D, 100E
Week 2 200D, 50E
Week 3 200D and on