Make sure you are keeping pressure in the bpipe headpipe. Acheive this result by restricting flow out the top of headpipe before flow control. I use a 3mm plastic bushing shoved in coolingline.
To get the most out of your flow control, you will also need a tiny tach. I have used the tiny tach brand, but prefer the hardline brand from amazon. They are so inexpensive.
I set my flow control valve to open at 3500- 4500rpm. Use above method on trailer, in water. Depends on how much flow you have through the chamber/headpipe. So a tach will help you dial it all in.
The drier you can make it, and the hotter you run it the better the performance,imo. But you can FRY your rubber couplers if not careful.