Yep - I agree with FishFreek - you need a larger intake surface area to decrease the flow rate/sq inch.
My Suggestion would be measure the diameter of the area arround where the screen is. As I recall this is a small 1/4" protrussion that is 1" in diameter and typically would fit into an uplift tube of an UGF
. I'll assume it's one inch, if not then adjust the following directions accordingly. Then drill a bunch of 1/8" or 1/4" holes all along a piece of 1" PVC
piping cut about 2" long. Cap one side of the 1" PVC
tube with a standard 1" Cap using PVC
cemet or even Silicon. Then glue the open end of the PVC
pipe to the protrussion on the powerhead with Silicon (Silicon will be strong enough to hold it but allow you to remove it if neccessary).
You may not need to use the Silicon as the PVC
may fit snuggly onto the protrussion.
This is one solution, you can adjust it accordingly. For example, you can buy the 1" clear uplift tubes from your LFS
and cut them and fashion the intake openings as you see fit. You wil have to find some method to cover the open end - perhaps using silicon to glue a small piece of plastic over it.