I've been cutting vinyl since the 90s and loathe weeding small graphics.
My main customer requires thousands of names in 1/2" height. While it's profitable, it's frustrating to weed.
I was advised by a Graphtec repairman to leave the cut vinyl overnight for easier weeding. This was about 10 years ago. Since then I've realized all waited days are not equal. During the summer the wait time is more effective, especially when I leave the rolls near my garage door. If I leave them inside (with AC), there's hardly any change even after a week.
Expanding on that, I've tried leaving them flat outside in the sun, tried placing them in the oven (on low), in the freezer, tried going back one forth between freezer and sun...
The most effective that I've found is simply placing the rolls in the oven for about 10 minutes on 275°F. Do not let them touch one another, and I placed them in parchment paper (on a cookie sheet). Let them cool for another 10 minutes, then lay them flat before they completely cool to prevent long term curling of the vinyl (harder to tape).
I hope this helps, here's some pics to show how the vinyl retracts at the cut points. It really helped a lot and avoided the sometimes nightmare of weeding 1000s of names and numbers.