I think you need a new vacuum head (and hose).
Here's my experience: I have a vacuum head that rides on wheels (bought from Pool Solutions) and one that has a brush but no wheels. The one without the wheels will suck down tight against the pool bottom and is hard to move. I also noticed that at times the hose was sucking shut and starving the pump for water. I went out and bought a new "good quality" hose which stopped the problem but I also discovered that he vacuum with the wheels did just as good job as the one with the brush and it is easier to use. Now I only use the wheeled vacuum head.
My point being that you may be resrticting water flow to the pump with your current set up.
Good Luck
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