[Basic Set] Advice for abstracting combat as a contest

[philosophyguy]

My play group has discovered that we enjoy official combat for major setpieces, but in most combat situations we don't need that level of granularity.

I am thinking about using the contest mechanic to abstract some of the detail of combat so it isn't as detailed, but I'm struggling with the implementation.

Has anyone done something similar? My current plan revolves around using the contest mechanic with each side needing some number of wins in order to win the encounter. I'm trying to determine a heuristic for deciding how many wins is needed in this extended contest, and how to translate the results into impact on HP/FP. We're playing a cinematic campaign, so I'm looking for reasonable interpretations rather than strict accuracy.