Thanks for the help.
You might find this hard to believe - I do, but I've done exactly that - all the steps.
And thanks, yes the covers are visible BUT still have the white banner over the foot of the cover saying Personal.
Additionally the covers are smaller than the native Kindle covers - this is not really an issue but the banner is a pain that I would love to get rid of.
Any further suggestions would be appreciated.
Am now considering stripping the meta data on each book and re-inserting. This was mentioned on a Linux site and at the moment I need to do some more investigating as I cannot see how it would cross over.