by default a task sequence does not use the ccmcache folder to deploy applications - it saves the locally to an auto created folder on the root of C:\ called SMS_tasksequence (or something like that). CCM cache only comes into play with individual applications and "most" are going to be under 5GB until you get into applications like autocad or some of the Microsoft developer tools. Be sure to check the smsts.log file which will give you why something is erroring out.