The Eclipse hoods and filters are a very nice piece of equipment, and it also looks nice! But I've always found them to be too powerful too. I have the Eclipse 5 gallon hex tank, and I covered the outflow with pantyhose.
You don't say what size filter you have, but try this -- lift out the whole filter assembly, the inflow tube and motor, the place where the cartridge sits, and the bio-wheel and outflow. You may want to float the bio-wheel in the tank while you work on the filter. I got some new, clean, unwashed black knee-high pantyhose and cut one a little bit above the foot. I stretched this part over the hole where the water comes back out. This is kind of right under the bio-wheel. When I put this whole filter/cartridge/bio-wheel assembly back in the tank, the tank frame held the pantyhose in place. This did reduce the outflow quite a bit. I still see the plants waving around gently, so I know there is still some water flow, but the betta's bubblenest is not torn apart anymore. The pantyhose does not act like a wick to bring up the water. The area around the frame stays dry, and you can put your cover back on and not worry about water puddling up in there.