I have a similar issue. Number one we have no weir doors our pool guy threw those away and said we didn't need them? Two the skimmers worked fine the first two months and now seem like they barely move? You can see some debris going into the skimmer and sometime down through the line but not near what it was a month ago. Could it be clogged or need to be adjusted and how? We have tiny gnats all over the pool every morning and I hand skim but the skimmer doesn't pull those in or pull enough to pull them down through the line.