G'day bobajob,
if if I could be more helpful I would. I have had my Pototo chip out at about four foot at Noosa and Mudjimba... It went really well. Surf in Vic (West coast) has been pretty average and dominated by prevailing winds from the south which is onshore.
If I lived somewhere that was offshore and 8 foot I could probably give you a report. Micmac has had his out on some really good days at Torquay and seems pretty stoked with its performance. I hope that helped.
cheers