First off, in the financial futures market, rest assured institutional investment size pays no attention to what pikers say on trading forums about their "trading secrets". We're simply trying to get a decent read of which institutional money side has the advantage at any given point in time where "given" is an area, not an exact price.
Very simple things can and do work. The money management "trick" is to bet in a way to where the market catches you wrong when you're holding your smallest amount of contracts and catches you right when you're up to a decent to full size in a trade. This does not discard the method of all-in/all-out, just that it's most likely more stressful given the more violent gain/loss swings you'll experience and that's why accumulation is easier on the nerves.
IMO, virtually any total piker can trade a micro NQ, RTY or YM contract where your max size is 1 to 2 contracts (i.e. represents 1 or 2 emini contract chopped up into 10 or 20...yeah, I know...duh!) and they're not doing dumb things like continually adding to a continually losing trade. Again, IMO, this is probably the most stress-free way to trade as being wrong on 1 to a few micros vs being right when accumulating them to a larger multiple will help keep you calm and cool during the drawdown periods. I would ignore the naysayers who would argue that the added transaction fees will nullify your edge. We're not talking about hyper mico-scalping here (where that case could hold true). For example, with a 10 micro contract max per trade, given the current volatility of the MNQ, one could expect to regularly make in the range of $300-$1200 in any given morning during the first 2-3 hours (just my personal experience).
As has been noted by many of the highly experienced traders on these forums, do not try to automate your daytrading/swing strategies unless you can master trading them manually in real-time.
[Nothing I do is "a trading secret". The only reason I don't post detailed trading strategies is because the blow-back of negativity or time-consuming answering of details ensures that absolutely no good deed goes unpunished. as an example, look no farther than NoDoji's prior posts before she left ET for good.]