G'day brunny,
Thanks for your honesty and a great qn too.
Well 1 fish every 4 hours is pretty average when everything falls into place you will see better results.
Re the sounder you are using, I have not used that model b4 so I can't help you there though I can recommend using burley. Even when you are fishing w plastics set out a burley trail and see the difference in results. I have found by burlying my results greatly imporved.
Good luck and I hope that helps