I just got my reef octopus 3000 recirc skimmer and it was suggested by another reefer to do the gate valve mod to it as well. I didn't do it but I did find that it didn't work with a pump rated for 1 1/2 time your tank volume. So I said what the hell let's try a aqua medic ocean runner 2500 to feed the skimmer. Valve is wide open and pump is not restricted at all, the crap it is pulling out is AMAZING I have to empty the cup twice a week.
So what I am suggesting is to try increasing the feed volume to see if that works.
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