When everything was working I was running the pump at 3050 RPMs and the pressure was at 20psi
Now at the same speed the pressure shows 30 psi
Filter pressure is an indication of how hard it is for water to pass through your filter and make its way back to the pool.
At 3050, if the pressure went up from 20 to 30, then something is keeping the water from getting back to the pool.
The filter is the obvious answer, but assuming it is ok, what else is in the return path. Something in the return path is reducing or blocking the water flow.
As a test you could take the cartridges out of the filter and see what happens.