I only posted here as it was relevant to the problems we were having with the same caliper, so thought it appropriate to let you know what the situation is or hopefully soon to be was.
As it stands Hi Spec have said they have tested the modified calipers and are going to replace the calipers with the modified ones once they have been manufactured.
One thing I find interesting, they knew of the problems last year so why they took the option to rebuild a faulty design seems a little strange.
You may want to give them a call to see if they will replace yours.