Fun idea is if the werewolf leans to monster side transformation becomes smoother, but you show signs in human form. Likewise the more human the more you blend, but the more painful transformation is. The less balanced you are the more you lack control of yourself.
While I haven’t settled on details (and these would probably vary by setting), this is more or less how I imagined the balancing mechanics would work.
At one extreme you have characters like Elena Michaels or Lawrence Talbot who spend most of their time as human and only change once a month, while on the other end of the spectrum you have Ginger Fitzgerald’s or Will Randall’s final form. Characters like Daniel Osbourne or Josh Levison would be examples of werewolves waffling between (e.g. both start out only transforming involuntary under the moon, then their wolf later learns how to transform outside the full moon to disastrous results).
I forgot to mention it before, but the same logic could also to be used to represent a wolf who gains a human form. This is a rare concept in werewolf fiction but it show up from time to time. Animals assuming human form is far more common in East Asian folklore and fantasy, and I suppose the same rules could be used to emulate that.