You set the average position size by changing the "maximum open positions" on the Advanced page. This setting defaults to 250, so it will assume each position size is $100,000 / 250 = $400. So if you are only buying $400 worth of shares, many times this will be a very small number of shares. If you change this setting from 250 to 25, then the average position size will be $100,000 / 25 = $4,000.
Then, if you want at least 100 shares, then the stock price must be less than $40. You add this line to your filter.
That's not my website, but those are my trades. It has been working very well. When I first learned about RSI(2) I was a non-believer. Obviously, not anymore!
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