are you saying finasteride and dutasteride work better when used with Testosterone? Is there synergistic effect is what you're saying? I think I read that Finasteride and Dutasteride can lower testosterone thus, supplementing with Testosterone might be effective.
The hormone that causes hair loss is said to be dht. So what finasteride and dustasteride do is inhibit testosterone from converting to dht. Take finasteride/dut with any other steroid and it will have no effect on minimizing potential hair loss.