Hi Geeza,
Patience is definitely the key. I tend to be a bit methodical in my approach. I would rather do 400 metres in a day properly than 4 km in a rushed way. I tend to use setting 4 or 5 these days and my unit runs fairly quiet. My mate bought his at the same time and can't get his above 3. Not sure why that is. Spent many hours with him and even swapped machines to try to quiet it down. He still finds gold though.
As mentioned previously, if you're getting pellets you're going to find gold. Just need to walk over it.
Keep at it, low and slow. It will come. :Y: :Y: