Hayward ec40 filter pressure

I have a Hayward ec40 filter and my starting pressure with it was 16 PSI. The manual says to bump around 7-10 psi increase. But when it gets to 20 PSI in about a week there is a noticeable drop in return water. I am guess that the increased pressure is due to the pool coming with a return with an integrated light that reduces that return line to 1 1/4 inch. But maybe not because it seems most returns have a reduced diameter. 18 FT AGP with the flex hoses that came with the pump.

A few...

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