Death and Taxes pretty much summed up my opinion. Trading on Mt. Gox means trading at a much higher risk premium (over 10% ?!?) and I wouldn't consider that to be an element of price discovery for bitcoin itself. I think you would have a better analysis of Gox prices if you charted out the magnitude of the risk premium over an average price of the other populated exchanges. As that premium expands/contracts the price would be less/more reflective of the underlying asset, and since Gox is still pretty much the flagship exchange it would mean any technical analysis would represent the overall market a little worse/better.

Without some sort of way to measure that element though, I wouldn't put much faith in any analysis of Gox prices as they relate to the overall market.