iCloud/Lion/Multiple Users issue

I run a iMac, 2 MacBooks, 2 iPhones, iPad & 3 iPods (yes just a few apple products!).
My problem is somewhere in iCloud sync & our User profiles.....I'll try to explain the full story to give as much context.

Before upgrading to Lion & iCloud, we ran 4 Users on the iMac (separate profiles & profile - login - images), all address & iCal synchronised with my MobileMe account. All the Address & calendar entries were stored to this MobileMe/User account only. Our iPhones, iPad & iPods all synced with the same Mobile me account. ALL GOOD.

Once upgraded to iCloud (and possible the upgrade to Lion???) I decided to separate out address book & calendar items for each user. So using the new iCloud/Mail,Contacts & Calendars preferences I have set each User with their own iCloud profile (i.e. syncing their own preferences etc) and additionally adding the other 3 users to their syncing (only Address book & iCal) to enable us all to see each others.

Problem starts here;
When I update the Address Book, marking the User address card as "Make this my Card", it appears to work (i.e. the little User icon appears beside the Address Card in Address Book), but when viewing the user in "User & Groups" (System Preferences) and subsequently selecting Address Book Card - Open , it does not always open/ the correct Address Card.......
When I have SUCCESSFULLY (actually worked for one) stored a address card, with image, for a user it appears to update the USER image too....BUT the the next problem appears to overide this....
When I switch users, the User images are all mixed up, i.e. my image is someone else's and someone else has me as their picture.
There seems to be some relationship between the Address Book "My Card" and the User Profile, but I just can't seem to work it out. I have tried only editing, in the particular users account, the address book. I have tried editing it on the web based iCloud. I tried editing it via the User Profile settings.......

I'm in a huge mess.
User A currently has User B image on login, but has correct image on Address book.
User C has User A Image on Login & address book even though I have changed it several times.....

Please help me work out the best way of using the iCloud, Lion & Address book & User Profiles

Cheers

Ang