Enlightenment
When a newcomer comes to these pages, seeking advice, over the years, the single most annoying trait is when, after professing to want to learn, he instead begins to "teach" us what he "knows" and what we don't know. The instant reaction from the veterans is to wonder why you came here in the first place.
Your conclusions are flat-out wrong. K-O is a perfectly viable system for any blackjack game. Page 176 of BJA3 compares systematically and extensively, Hi-Lo, Red Seven, and K-O, over all numbers of decks, rules, spreads, and playing methodologies. And while K-O, in most instances, underperforms Hi-Lo by about 3-5%, that is a far cry from saying that it "doesn't work" and is unsuitable for the 8-deck game. Winning $50 an hour, instead of $52, doesn't make a system "worthless."
You are frustrated because, to you, personally, investing three months of your time and money should have left you with a profit, so you are bitter and want to blame your personal negative variance on the count system you used. This is foolish and shows a lack of understanding of the endeavor you have embarked upon. Compared to dozens (perhaps hundreds) of players on this and other sites, your results are not only "normal," but are probably a lot better than the worst three-month stretches they have had using highly sophisticated, more intricate, and more profitable counts than K-O.
It has been my experience over the 35 years that I've been at this (writing and giving advice) that a small segment of the posters come with preconceived notions and it is impossible to disabuse them of their erroneous ideas. You may fall into that category, so don't expect this to turn into a debate as to who knows more about the game.
All I can tell you is that when the foremost blackjack computer programmer in the world, Norm Wattenberger, runs a simulation to explore a concept, he doesn't consider anything under 100 billion hands to be "reliable" enough. So, when you write to us about how K-O "doesn't work" because of your three months' worth of bad luck, you will understand how some of us react the way we do.
If there is one thing that I have written, oh, 500 times on these and other pages, over the years, it's that your personal results mean absolutely nothing from a mathematical point of view. Suppose another person had come on here and written: "I have just concluded the three greatest months of my life, playing blackjack. As a newcomer, I am using K-O, and I just can't seem to lose. I win every session I play. This is the greatest thing since sliced bread."
Now what?
Don