Advice on Commission Model

Hi all, I head up the Customer Success team at my company (Fintech). I've been building up various aspects of the post sales department for 2 years now and my most recent challenge is to truly embed Upsell and account development in CS and shift these responsibilities from the Sales team. One of the things of my mind is our compensation model. This is still relatively reflective of how things used to be, when CS was more of a support function. 

I would really welcome thoughts on the types of compensation models (Sales vs CS) that work well, and particularly how to manage what might be quite a big change (always the hardest part). If you feel more comfortable discussing this topic in a call rather than in a public discussion, that would also be really welcome. Thanks a lot in advance for your thoughts!