The strategy as a whole doesn't make intuitive sense to me - you're willing to buy high, and sell low, and that's the way you lose money!
Even in limit orders, I'm curious why you'd want to do that. For instance, if a company gives a 10% dividend, and you offer 10% over the unadjusted price, you're essentially certain to buy that stock - the price just dropped 10%. Logically, you'd want to place a limit order that is 10% over the adjusted price.
All that said, there isn't a direct way to access unadjusted historical prices. What you can do, if you want, is store the close price at the end of each day in a list, and that will obviously be a list of unadjusted, as-traded prices. The downside to that is that your algorithm has to run for 10 days before you can fill your 10-day window.
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