Congratulations on automating. You will be glad you did. In regards to back testing vs live. Some strategies backtest's translate well and accurately into live and others do not. It is very important to know how well yours does because it can severely alter your results when going to live. The best way I have found to do this is run the strat live and then tediously start to compare it trade by trade to your backtests results. You will start to get a feel for where the limitations are and if the backtest is even close to what happens live.
Here is my basic process
2. Run strat live feed but on SIM account and compare to my backtest (If I am getting fairly close results I go to next step). Do this trade by trade on exact same trades.
3. Run strat live feed on my real account then compare to my backtest.
I do the above on enough trades that I get comfortable my results are accurate to my backtest before "officailly" making it a part of my live trading.
"The day I became a winning trader was the day it became boring. Daily losses no longer bother me and daily wins no longer excited me. Took years of pain and busting a few accounts before finally got my mind right. I survived the darkness within and now just chillax and let my black box do the work."
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Buying volume and selling volume has nothing to do with the place in the order book. if you are considering looking at the inside bid and offer then once you move at least 1 tick away then the book is refilled by HFT and marking making algos already. So no that i dont believe your getting your 50%. I suggest you read larry harris's book on market micro structure to get a clear idea on how markets work and how orders work.