MRL is raving , about this system. He uses it, seems to have tuning down. Being you bought an engine from him, would it hurt , to ask him about tuning information? After all, you a customer.
I was thinking the same thing after I read about his 422 build. I wonder if Mike has had an opportunity to actually drive a car with the FAST 2.0 system yet. The bugs in ours never showed up until we were on the road. I would assume that the dyno time would simulate some of the same loads that the system has to adapt to, - but not to the same extent. If he's only used it on the dyno then he's much less likely to have picked up electronic noise as you would in a car.
I was thrilled to see that he was using that setup. I also need to ask him if he's allowing the FAST ECU to timing control. We didn't have as many issues when all it was doing was controlling fuel delivery. My son was also eager to hear what he had to say. I'm planning on calling him in the next few days.