I have a 97 Sunsetter LX and here's how I have both of your questions answered.
1. I put in the bow cushion myself. First I had some plastic tabs made at a plastics store (TAP Plastics) and mounted them so when the cushion is in place it will support the cushion. I used 4 tabs. Second, I cut a piece of 3/8 inch plywood to size for the cushion. Third I bought a piece of dense foam for the cushion that fit the plywood's size. Lastly I brought it to an upholstry place and had them cover it. It works great.
As far as weight goes, I run quite a bit of weight in my boat as follows:
1. 550 in the locker (Skylon Locker Sack)
2. 350 in the walkway (fly high tube sack). BTW: You can't use the cusion when this sac is in place.
3. two water bed tubes under the cusions up front (about 160 lbs total)
4. A 600 lb sac between the back seat and the engine box.
5. 100lbs of sand under the back seat in four tupperware containers.
It's a good wake.
However: given your situation, you do need to balance out the effects of the wedge. The wedge is pulling the back of the hull down, but to shape the wake up a bit, I would recommend at least putting 550 to 750 lbs in the locker.
If you have not replaced the prop, you may want to consider an ACME 525 three blade. It really cleaned up my wake alot.