That filter is not the flow problem as I see it. It is what I use on my waste oil burner. The low bypass pressure is not good for your application. If you stay with it I would change it a lot more often to keep from bypassing dirt to the hydro unit.
These are some high quality filter for your application.
These filter have a 50 PSI bypass so there is less chance of blowing dirt into the high pressure side of the hydro and damaging it.
The Fleetgard HF 6446 has 7-9 GPM flow rate. This is top of the line Micro-glass filter.
John Deere uses it on there 2243 Greens mower
The Wix # crosses to 57102.
The Baldwin crosses to BT 8301
Edited by ducky, November 19, 2016 - 07:11 PM.