What times are you trading?
I am trading in the mornings (2am-4am cst) and then again from around 6am -10am.
You say that you are looking for volume imbalance and exhaustion.
How many quality trades are available in a typical day for you?
I am looking for small moves (10 ticks) +/- and there are plenty on most days. Of course if there are indications the move is strong I leave my runner open.
What challenges have you faced in trading volume imbalance and exhaustion consistently?
My biggest challenge? Imbalances happen on almost every bar; determining if they are a tell is difficult.
What is your best insight or clue that there is imbalance or exhaustion?
Imbalance is easy; Rancho has a volume impression (aka footprint chart) that will color any price that is a % above the corresponding price. Lets say to market orders hit the offer and 35 hit the bid it will highlight the 35 on the bid. Of course one price level imbalance means little; if you have a series of imbalances in on bar or neighboring bars it is something to watch.
I do not know if "exhaustion" is the correct term but when I see buyers drying up (or sellers) it is time to get ready. It is really sweet when there are 100+ market buy (or sell) orders sitting at a price extreme and the market moves away from them. The footprint chart is very helpful in that you can see how many traded right on the chart instead of trying to keep it in your memory. The perfect setup is buyers dry up, the offers firm up on the DOM, the bids start pulling and there is a noticeable shift to selling on the tape.

ops: Didn't notice the original post date. Sorry.