I have experimented with T-Rex since its inception and have lots of fun with it. It works generally well, but has what I call in my head, "inevitable drawdowns". I guess they hurt because I am overtrading for my account size.
One of the first things I did was start running weekly optimizations on stop and target. That was pretty successful. There are some market conditions where nothing that I did seem to help.
After being inspired by Ninza.co's mixing and matching of indicators I add Ruby River to my T-Rex chart. I could trade with it, but right now it's just a trend reinforcement tool for me. I like the visual quality of it.