I've got a closed bow 1990 Sanger DX. I'm not sure how it would compare to your Moomba, but I recently started adding weight and am now a happy man. The following is my setup, which I arrived at based on input from fatsac on WW (he has the same boat as me)
I ended up adding 100lbs under the rear seats and 150lbs way up in the nose (steel shot bags). Like you, I noticed that I needed to be careful crossing the wakes to pick up a rider. A friend took water over the bow when picking me up... to my horror, I watched as it ultimately washed up and over the windshield... no harm done but, at the time, I was worried about my camera gear that was in the boat.
I could definitely see a difference with the 250lbs added but, after seeing fatsac's photos, I decided to add Fly High Side Sacs as well. So that added 260lbs on each side of the engine. They take floor space, but are only 12" tall... fatsac used 440lb sacs on each side of the engine, but I was afraid it would be too easy to take on water... especially with some of the other drivers.
At this point I couldn't be happier. I just needed to show each person that drives it how to cross the wakes and to be aware of the bow.
Sorry for the rambling... to summarize:
100lbs steel (rear)
150lbs steel (nose)
560lbs fat sacs (260lbs each side of engine)
Normally I have 3 people total in the boat, which helps a bit more. (2 up front, 1 at the back in the middle of the seat to even things out).
Here's a pic of my boat for comparison, but also the wake with just me in the boat.
Hope that helps in some way.
I've got a Fly High X-Pole not shown
This is at about 20mph / 2600rpm
(Message edited by goerlich on June 21, 2007)