I'm all for tweaking systems, that's what makes them work better (hopefully), but if you can get a set of iron clad rules to work by (at least until the next tweak) that's wonderful. I find nothing more annoying than having a system which forces you to make decisions on a race by race basis. Shall I back this one... I'm not to sure about that one... etc.
If you trust your system implicitly it probably means it's doing it's job and being successful. If you're dithering over every bet it recommends the system probably isn't ready yet and you need to work on it some more before you use it.

KV