There is nothing scheduled for the Tigers that I know about.
The 16 and 20 Nationals are the week after the Mini-Mega.
Even within the HCA there are scheduling conflicts. I know this has hurt registration at both events.
As for the Tigers, I believe that HCA and the F18 guys need to get together and some how work it out that all F18's are welcome at HCA events and that manufactures can be broke out at the F18 Nationals.
The Tiger, Cap, Nacra etc.. National champs can all be crowned while still having the overall F18 Champion.
This would be a compromise for both and could be done on a trial basis.

Pulling on the fire suit.