Just to close the loop on this, I never found an answer as to why this was occuring. I went through the above post and tried everything in there along with many other things I found elsewhere and...

I just purchased a EAP 225 v3 and am using it with my ISP's 400 Mbps service. When using the ISP's provided wireless router, I get 300+ Mbps in bandwidth. When I switch over to the EAP 225's network,...