We're having the same problem that real backmarker teams are having. You either get in the top 4 or you're fucked and stuck in a midfield loop.
As long as we use the same points system as FOM we'll get the same results. So, some tweaks are needed. I'd say more than one wildcard event per entry would get confusing, annoying. So I vote for one. Make the multiplier anything between 1.25 to 2.00 and I'll agree to it.
Maybe forbid two drivers from the same team, either as a rule or by pricing them out.
Also driver value should be a factor of driver times team. Or division, whatever.