I think a system is a good thing in terms of providing a framework for everything you're working on, though I look it more as a life practice consisting of spiritual, physical as well as traditional "PD" sorts of things. I don't know the system you're referring to, but the problem I have with a lot of systems is they they are too low-level. That is, they don't give you a framework to discover and implement a practice tailored to yourself, instead they give your a practice that is representative of the values of the author and based on the particular inclinations and predispositions of the author. I actually just posted to my blog this weekend about some formalization I've done in the past as a precursor to talking about what I've been developing for the past several months. It won't give you any direct advice, but it might be useful food for thought on the topic:
The Birth and Death of a Personal Growth Practice | Manifest Revolution