Thanks for following up to confirm! Since you’re on Windows it seems like you’re running into the issue that we currently have filed. I’ve gone ahead and added your case to our report.
While there isn’t currently a good workaround for this issue on Windows if you must scale down your snapshots, it does look like the snapshot quality is better in the version 9 beta. We wouldn’t advise using the beta for critical projects yet as we’re still working out the bugs, but hopefully that will help when full release comes around. In the meantime, please keep an eye on the release channel for updates about incoming fixes for Axure RP 8. Thank you!