I have a Barracuda MX8 vacuum that I've been fighting with. It's just hasn't been consistent. In my trial and error testing I found that my pump needs to be running at 2900RPM to make this thing run. There is a test of how long it takes for wheels to turn 10 times. Does this sound right? I bought this vacuum because it claims to be running at a very low suction. For this test I had 100% going to the vacuum line with skimmer completely shut off.