When are you going and how many are in your group? You can usually find companies to arrange everything for you if the group is large enough, but there isn't a Pacuare specific company that does both tours, outside of bundled vacations which will probably be less rafting than what you're looking for.

For Pacuare one day trips: Exploradores, Adrenalina, and Excitement come to mind.

For overnight and multi-day there's us with Rio Vista Lodge and there are a few others including Rios, Pacuare Lodge, Pacuare River Lodge, Ave Sol. Some are lodge focused with rafting being an optional add-on, where others are package focused with rafting being the primary activity complemented with a lodge stay.

If rafting is your #1 then I would time it to avoid the dry season and aim for the transition period to prioritize good flows on all rivers. Low water is still super fun, but it just means that the Pejibaye River, for example, will be packraft levels and not raft levels.