Hey Big Guy,
I remember this being an issue when the dates were set. I'm pretty sure Darren is aware of the clash of dates but has been forced to change the dates so often that AMF were left with always clashing with something so I guess the decision had to be made to clash with something that had the least effect on each other. Namely Richlands with Mackay and I'm pretty sure Capalaba clashes with Townsville but as I said I dont believe they have any other choices.
I dont know if any other openings have opened up during the course of the year that would allow a move but I'd be a bit surprised if there was especially seeing Toowoomba has also been looking for a free weekend, so far without much luck.
As far as which one to bowl I vote seeing you bowl so well at Richlands that I dont think you should waste those tickets and definately head to Mackay, especially seeing I'll be at Richlands.