If you make a small sample test of negative progression (Martingale f.ex.) versus a positive progression like the Guetting progression, you will see that short term the negative progression will have a higher succes rate than the positive progression. Long term they are of course equal.
But its the same thing you face when you apply the KC, there will in the beginning be streaks where the KC seems to be the wrong choice. But you have to remember that the KC is considering 2 things:
Keeping the bet size at a size so that the possibility of going bankrupt in the case of a negative deviation, despite an edge, is kept at a minimum.
At the same time keep a maximum growth in the bankroll.
If you don`t need number 1, and just want the maximum growth, you might as well apply a negative progression. Which if you have an edge, actually is “okay”. BJ players swear to KC because with only +1% edge, the negative deviations are quite scary. Its a little bit different in roulette, because usually we target higher edge percentages and we can also tell if our edge is still there or not. Still, if we hit a casino with a 20.000$ bankroll, we still face a bankroll of 200.000.000 or something. Any mathematician will say: “Run, god dammit, run” even if we maintain that we have an edge of 10% over the house. So generally, as a safety matter, i would recommend KC because it considers both safety and maximum growth.
I would also recommend learning some sort of VB or light VB, not as a direct prediction but to filter out the spins you are pretty certain comes nowhere near your biased numbers. You could as a safety, just play with minimum bets on those spins, in case the unthinkable happened, then you will get some anyway.
If you consider dividing your bank in 4, you could try and backtest your number stream with a negative progression inside each 1/4 of the bank. If you bust out, you have lost 1/4 of the bank, if you win, you can either add it all to the 1/4 you are playing with or divide the profits in 4 and add size to all 4 parts.
But first backtest, then fine tune, and then play.
Generally, the higher edge you have, the better growth will the KC produce. On the contrary, if you have rock solid cash flow when flat betting, you might wanna consider a negative progression with a very flat rise in bet size. Just don`t throw rocks after me if you go bankrupt after busting out with high stakes after a negative progression, because i would probably say: “I told you so”.