Well spotted, I deliberately left that info out. We did not use the Imm exit function and did use the DCT TO a waypoint further down route. As you know Airbuses have a long history of the FMGC getting confused with its predictions if Imm Exit is not used, but it is perfectly acceptable to use the DctTo in our SOP if you want to and all the elements of the hold had been removed from the flight plan page. Even if this was the problem, it doesn't explain the speed properly, which was below Green Dot and only just 1kt off VLs and the managed hold speed should have been about 5kts higher than that.
Thanks for the response, though, I suspect this will be another 'whats it doing?', 'its an Airbus' thing.