If the sony driver is auto-installing then you must have a remnant of it somewhere.
It might be worth going through a reboot between each stage to see if that helps. e.g.
1. remove Sony driver and reboot
2. Install calibre driver and reboot
3. Plug reader in and see if Sony driver is installed again.
I know I had trouble getting rid of the Sony driver for my PRS-500, but once I had succeeded Calibre picks up the reader every time with no problems.
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