IOS 5 iPhone duplicating some calendar events when iCal events on iMac have no duplicates

I've searched in vain on these forums but can't find a problem quite like mine. I am running
- iPhone 4 with iOS 5.0.1
- iMac with Lion OS X 10.7.2
I was using iCloud for all my calendars but found that my phone battery was draining very quickly, so decided to go back to using the iMac to sync to all devices. I exported all my calendars (seven of them) from iCloud through iCal/File/Export/Export, and then imported them as new calendars. I deleted my iCloud account on my phone and iCal. I then synced from iMac to iPhone and all went perfectly, except for my primary calendar (typical...).
All events for all calendars appear perfectly in iCal on the iMac. But my primary calendar, on my iPhone only, has duplicated nearly all the events in it. There doesn't seem to be any pattern to those events that AREN'T duplicated - some are annual, all-day recurrences, some are one-offs.
I've tried deleting the cache and the plist from the iMac library (even though, yes, the iMac iCal appears to be working perfectly), then resetting the iPhone, and resyncing - using the 'replace information on this iPhone' option for Calendars. No luck. I've tried re-exporting the calendar from iCloud, then re-importing, then resyncing to the iPhone. Each time it duplicates on the iPhone, but not on the iMac.
Weird - and this is driving me mental.
I'm guessing the calendar might be corrupted or something - is there an equivalent plist or something that I can try deleting from the iPhone? This has gotten beyond my skills!
Pleeeeaaaassssee heeeelp!

Update:
I ended up going through the duplicate entries on the iPhone and manually deleting the second entry in each instance. I re-synced to iMac, and the duplicate entries stayed deleted, and nothing appears changed on the iMac calendars.
I then synced iPhone 3GS and iPad 2 to iMac, doing the same process with the calendars. I noticed that I had missed one duplicated entry on my iPhone originally, and that this had transferred to each of the other machines too (ie they all had two identical entries for the same thing) (but not on the iMac, still). Deleted the second of the duplicates again on the iPhone, synced everything, and it was gone from all.
So all in all, not a brilliant fix, but a successful one nonetheless - although it remains to be seen whether the duplicates will reappear at some point, as I've noticed other users have had that problem in some circumstances. I'd love to hear if anyone has any brilliant thoughts regarding this, though.

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