Just a stupid Modified guy here but here is what I would do. I think the midweek thing might work but you need to get it away from the weekend so cars can be reprepped for Friday etc. The first 8 races. I would use as an experiment. My Schedule would look like this
Race 1: Friday
Race 2: Wednesday
Race 3: Sunday
Race 4: Friday
Race 5: Wednesday
Race 6: Sunday
Race 7: Make up day
Race 8: Make up day

Now notice You could do race 1-3 in a 2 week time frame etc. But at the end of 1 month you would know what is more beneficial for the race track. Some would say this would make the points hard for someone to chase so during this time frame you say only your best 3 or 4 nigths count towards the standings. Thats my 2 cents worth.