OK, I am preparing instructions on the basis of that information.
1. turn Off the printer, and then unplug it from the power.
2. go to the Printers list, and select each instance there of your Epson XP620, then remove it with the - button.
3. restart the computer. (You can come back to this case after reinstalling, at
4. then go to
and download the Drivers and Utilities Combo Package, then once it is downloaded, install it, by double-clicking on the DMG file (if it doesn't automatically start the installer program.)
Then you may go to the Driver settings for the printer, and then you may look for the setting for 'Drying Time' or 'Ink Drying Time', and set it to a shorter or lower value. That should curtail the ink blob tendency.
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