It sounds you should open MS ticket if you think the ADK 11 is buggy. Do you actually have old Boot.wim file as back up, what happends when you import it as additional image? What errors, error messages and maybe smspxe.log or smsts.log you are experiencing when you say it is failing?
As a work around, how about just forget about pre-provisoning bitlocker, and let it encrypt after the TS is finished? With SSD pre-provisioning is not critical anymore, with SSD it will be much faster at the end. Also, if you want make sure your end users are extra happy about the bitlocker, disable pre-provisioning and at the Enable Bitlocker step just enable the option it will stay there until encryption is finished. Or use manage-bde commands there.