At some point, at the low end of capitalization, the percent at risk method, is really not that useful. Consider the percent of commissions, or if commission free, the spread or slippage, to the P/L. Once those are double digits, it might be telling you there is not enough capital. A lot of people do the percent method, thinking this is what I will do when I am moving orders of magnitude more. But you are not moving orders of magnitude more.
Another way to look at this is saying I made 1000% on a penny, although true, does not really translate into making 1000% on 100K. The realities of trading kick in.
Another way to look at it when you have smaller amounts is, by pure dollar amount. Then put that back into percent as a check. If I were doing 2K, I would say I will risk 25% because 500 is something I can replace. That frees me to make 25% on the upside (assuming you have a legitimate plan). Then in the end I have 2500 in a trade. How long does it take to get to 2500 2% at a time? You might have time, but truthfully, not that much time.
Try to get to 10-20K quickly taking some WELL CALCUATED and THOUGHT OUT risk. Then you can start with the 2% stuff.
Of course, all I said, might be totally bunk for you, or in general. Only you can decide.