callmeammo

I have a Zodiac Barracuda MX8 that I just installed. For it to work properly, it seems to require me to either entirely or nearly entirely shut off the valve that connects the skimmer to the pump. The skimmer and the line for the vacuum are separate, but both go to the same pump. Before I installed the Baraccuda, as long as the filter was clearn, I could have each open to 50% and both the skimmer and vacuum would work. There is no main drain. I have all returns pointed up. The zodiac manual says to point them down, but they are currently set up perfectly to move water towards the skimmer. Is it that important that they be down? Thank you.