Do a gut check, Buddah
Your system is fine. HiLo is fine. KO is fine. So are all the others. Some are easier to use than others, but for your purposes, pick one and stick with it.
The problem we all face is that even the best system only slightly tips the the odds in our favor. Any given session, or string of sessions, can result in a negative outcome. That's the nature of the statistics behind the game.
Changing systems will only frustrate you further when you experience the next losing streak. Pick a simple system and master it. Recognize that no system will guarantee that your results will be equal to the expected value (EV) result.
You may do better than EV, you may do worse. You have a 50/50 chance of being on one side of the EV line or the other regardless of system. There's still an element of gambling with even the strongest system.
So the key question is not "is my system OK?" Rather, it's "do I have a psychological profile that will allow me to keep playing even though I'm losing session after session?" Some people have it, others take up simple, less frustrating games, like golf...:laugh: