Water Pump Replacement...Looking for hi flow unit

I bought the Seaflo 55 a couple of months ago just to get back to the high flow my old Sensor 5.7 had (RIP). It's junk. Just makes a lot of noise, cavitates and rumbles but the Seaflo doesn't put out any more than the Shurflo 3 gallon per hour (4008) that came with my trailer. It's a total disappointment and has been relegated to being a back-up pump in case the Shurflo quits.
When Shurflo comes out with a bigger, 5 chamber pump, I'll buy it.