I need to get a few specific stats:  top contributors per board, and top contributors per topic for a given time frame. Does anyone know of a way to this? Or an application/plugin/query that does this? I'd be willing to pay for help. 

https://invisioncommunity.com/files/file/8690-advanced-stats/

Not 100% sure if you can filter it down to the level you're requesting although its about the nearest I can think of for what you're requesting.

The support topic would (as you know ) be the place to ask the author directly if it will do what you require. You can find said topic here:  https://invisioncommunity.com/forums/topic/440524-advanced-stats-support-topic/