My old return pump burned out and I finally replaced it with a QuietOne 3000, but I'm afraid it's TOO powerful. I've added a second U tube to the overflow and widened the slot on the pipe holding the screen, but the water level in the tank still seems to keep rising to the point where I fear it'll overflow. My last option is to install a valve in the return plumbing to control the flow back up to the main tank, but I'm worried that this will put undue strain on the pump. Is this a legitimate worry? Or is this standard practice?

John