I have been playing with what seems to be a good backing selection method so far ....
For how long have you been testing that method?
I'm no expert but here is what I can recommend you, if you are confident in your method.
You could use the simple one, wich consists on betting the same % of your bank everytime. You can, however, tweak this, as you know. I can give you two really simple examples.
I like the 1326 sequence. You move one on a win and go back to the beginning if you lose. You will have a nice profit if you finish the sequence.
Similar to that is the Fibonnaci (1-2-3-5-8-13-21-34) one step up if you win, two steps back if you lose.
The D'lambert could work with your method too. It consist on adding a new stake every time you lose. And reduce one everytime you win.