Hi Dale. I think there are a few things coming to play:

1. Economy - spending is down, entree fees, fuel etc cost a lot, and people will pick and choose the events more, I think this year will still have lower entries all round.
2. Your class- it is restrictive, on purpose, but of course you will feel the pinch easier with smaller reserves of runners
3. People like to win - the cost of doing so in your class is probably quite high. Maybe you need some classes within the category, have some reverse grids, handicapped?
4. Eliteness. I think the post you did a while ago showed your opinion of some other classes. Some would not share this, and maybe you need to acknowledge this and be a bit more total picture friendly? maybe encourage events where your group, plus modded cars wtc get together and boost your presence.
5. Time. You are new, not that different from muscle cars, just need time to establish. You may need to run your class within other groups sometimes?