If you use KO
you should be making a little bit less per hour. Because KO is less effective than Hi-opt II or some other advanced counting system. I personally think that Hi-opt II is perfect. Yes it is hard a little bit to master it, but it will give you extra advantage, that will make you more money on average especially if your bankroll is larger( difference will be more noticeable)
Spread 4 means if your minimum bet is 5 bucks for negative counts your maximum bet should be 20 bucks 5x4=20
so your betting would look like this
5 - 10 - 15 - 20. In general your bet amount depends on advantage you have. You should bet in proportion of your advantage and bankroll.
For example: Your bankroll is let's say $ 1000. You are counting cards and at the certain point of the game your advantage is 1.5 percent, that means that you should wager 1.5 percent of your bankroll. That is theory. I personally would not bet more than 1 % of my bankroll even if advantage for me is 5% (which happens very rarely). Money management and optimal betting is as important as card counting, and many players who count cards lose their money simply because they overbet their bankroll. it is not enough just to count cards to win. You have to apply proportional optimal betting in your play. This is very broad subject, but there is a great web site
http://www.bjmath.com (Archive copy) that will help you a lot! And there is camouflage