i have sw fh and eastern 1hbh for grounstrokes. i return serve starting in continental since for me i can get to fh or bh grip more quickly and am ready to chip/block the return if there is no time.
I have 1hbh, and use one grip - Australian on both sides.
on FH side, it allows for chip, block or slight topspin
on BH side, it allows for slice or block (topspin is tough)
The closer I move to continental (from Australian) on both sides, the FH topspin gets tougher (but doable) and BH topspin gets easier, but BH slice gets tougher for me with conti..
i never heard of an australian grip where is your index knuckle and heel pad on the handle with regards to the bevels. for example continental is usually inex knuckle on 2 and heel pad on 1. some slide alittle to the forehand side making it 2 1/2 1 1/2. bevel 1 is the top of the handle.