Automating Job Fetching in Clay: Managing Source Limits Effectively

I have a question about managing sources in Clay. The source for one of my tables is "Find Job." What I want to do is automate the process of fetching X number of jobs every day. My criteria do not change. So, I would like to keep the source as it is configured and have it run once per day. However, every day I am forced to manually increase the "Limit results" value by X (for example: Day 1 - 40 results, Day 2 - 40+40=80) in order to get new results. Otherwise, the source does not import anything, even though it does find new jobs. Is there a way to run the source and have it import X results at each run without having to modify the limit manually? I also want to avoid having to recreate a new source each time. Thanks in advance!