A review for Circle stickers by William N. Gaillard.
Everything's fine, the QA/QC was first cabin, and everybody over here really loves them; however, they need to be cut just about 2mm wider all around in order to enable a bit easier separation from the backing. Alternatively, the better solution would be to simply produce them on tape and reel.
Ostensibly, there would be a proportionate materials' cost increase and, of course, re-tooling charges for the new format, but it would make separation of the stickers that much easier for your future customers.
You could always simply offer it as an option, and I believe you'd have some takers for the convenience.