Have you guys thought about running a different bag? In my A20 i run the flyhgh 1000lb triangle. Although it only holds 400 under there the fill and vent lines are on the top of the bag. The fill line port is in a area that does not push up the cushions and the vent is at the tip of the bag so it actually goes up into the hollow spot of the bow/nose area not pushing up any cushions either. My bag will drain itself back through the drain pump and out the drain through-hull but only does it when running the wedge at wakeboarding speed. When running 2500lbs ballast and no wedge it doesn't do it but the wedge seems to drag the back end down just enough for the sack to be able to drain due to the pressure in the drain line. Also just to let everyone know that has a 16 and up A20, or any year T22 and T23 wakemakers has a bag designed specifically for our boats. It is kinda pricey but was laser measured to fit exactly in our boats. You can only get around 400lbs under the bow cushions. The drain is at the bottom middle of the bag and the fill and vent ports are both at the tip of the bag so they will be up in the hollow spot of the nose. If anyone is interested in this bag here is the CAD from wakemakers.
