How to have rclone re-evaluate queue when remaining files below transfer limit?

Question

I have multiple rclone sync tasks with their own unique filters that do not overlap. Only one instance of each task can run at a time so that I can limit the number of transfers occurring simultaneously. I also don't know how well rclone deals with 2 syncs attempting to upload the same file. The oldest files are transferred first.

The problem that I am running into is that a task may have one large file uploading out of a 3 transfer limit. The final large transfer blocks the syncing of newer files that did not exist when the task started.

Is there a built-in option to have rclone re-check for files that match the filter when it has begun transferring the final files from previous check, or a standard way to handle this scenario while 1) being able to control number of transfers, and 2) not running into problems with overlapping upload attempts?