Well done. I suppose the question marks mean that they are educated guesses. I just spent 2 minutes looking for some more. Here we go.

QRCCRA - Queensland Radio Circuit Car Racing association
SORMCC - Sydney On Road Model Car Club
BRCC - Brisbane Radio Control Car Club?
ACTRCCC - Australian Capital Territory Radio Control Car Club

Some others I'm not sure of

BRCA
IMCC
NSWRCRCC
SRCORCC
GCRCCC

Acronyms send me up the wall at work but this sport is getting worse!