You shouldn't use buy/sell depth at all. ever. as a trading indicator.
There are so many more reliable indicators based on the chart and volume.
Whether you want to use chart patterns, fib levels, moving averages, volume break-outs, etc etc.. there are heaps that re far more reliable than buy/sell depth.
Anyone can put buys down at any time and never intend to buy. You're just guessing peoples motivations and assuming that all the buys are buys and all the sells are sells.
