HubSpot Lead Rotation

Hi, We assign incoming leads a level (1 to 3). Once given that level we want to distribute these leads among our sales people. HubSpot's default 'Rotate leads' step in Contact workflows is too limited. It assigns leads evenly, but we need to give weights to our sales people like 2/2/1 or 40%/40%/20%, ( e.g. to seperate between senior and junior sales reps ) We found something that seemed to suit our needs, using a webhook step to the URL which hosts an app ( read it here > [login to view URL] ) After some questions from our site, the developer told us it was limited to just one workflow. We need three seperate workflows as we need the 3 categories of leads to be distributed seperately.