Munchy, dont pay any attention to the depth on the sell side. I am not going to give you an explanation for it I'll just give you the facts:
Look at depth after the market has closed and after after-market trading is done. Maybe 18:30AEST. The depth is always even or around that. Sometimes its in favour of buys.
In terms of the other stuff you mention, I would not use it as an indicator of gold price behaviour.
SAR Price at posting:
38.2¢ Sentiment: LT Buy Disclosure: Held