I agree with your observation that the trade-management parameters (position-sizing, targets and SL) are very often where people go wrong. This observation is equally true of both manual and automated trading.
Yes, so far ...
Clearly you've done well with this, and have been profitable for over 3 months and for over 700 trades, and nobody can take that away from you. I hope it continues.
My own main reservations, looking at your figures, are (a) that's you've had a 30% drawdown, and (b) that your average loss is three times the size of your average win, and (c) that your profit is dependent on about an 85% win-rate.
With those parameters, your win-rate would only have to fall from 85% to 75% for the profit also to disappear.
You will perhaps say "Well, that hasn't happened so far, in over 700 trades", and whereas that's perfectly true, the degree of confidence you've so far achieved regarding statistical significance really isn't that high. Yet!
I hope you'll excuse the observation that I wouldn't be putting money into it, myself, on the basis of the figures you're currently showing. I'd want the drawdown to be a lot lower, and/or to see far more figures to assess the statistical significance, before thinking about that. (I appreciate that you're not trying to promote/sell anything, of course.)
I wish you well with it, and will be interested to take a look at it after another 1,500 - 2,000 trades and/or another 6-8 months.