my 2 cents worth (with a view to the upcoming build meeting)....
I don't believe the only solution is to make the jumps table tops. The problem is that the track is hard packed. It feels like a fast, downward facing bmx track in the top section, it's too scary and open to pin all the time, which you have to to hit all the jumps and connect the track properly.
Coupled with the jumps being quite big, means you pedal and lay off the brakes, which not everyone wants to do all the time, a great track (public) can be ridden hard or not so hard, depending on how you feel or what your ability is. So, by filling in the gaps, sure, you make the track rideable by more skill levels, but you still can't really get a good flow happening without pinning it.
If only there were a way to 'un-gravel' the top, or re work the track a little so it doesn't have so many potentially huge off points because you are trying so hard to connect it all. I would say mellow the track out and make it a blue or single diamond standard, and petition for something else, gnarlier, steeper, and with more dirt/natural flow.
Yes, I am more than happy to lend time with a shovel if volunteers are allowed.