We are with AAMI and have actually found them quite reasonable compared to others, maybe if you called them and asked if there would be a discount if you had 2 policies with them?
We also have our house and business insurance with them so that may make a difference.

Used to be with RACV but we moved from 1 suburb to another 5min down the road and in a safer street and they started charging me $50 extra a fortnight.. WTF

All i can say is it pays to ring around, get quotes and sometimes call YOUR insurer back and say well RACV has offered me this rate, what can you do to keep me.