A big FS is fine, and will cause no harm. We are going to change the recommended 50/50 % ratio split to a 20/80% ratio split, if we have no done so already - the logging needs more space than the binary location.
I see that your tenant has had an entirely new AU created, and it must be with a different file system layout as I see your AU's Isilon collector is collecting happily.
Within the last hour, we have assigned a new AU build to your CI tenant, so that if you were to add another AU with the original symlink problem, you would NOT experience that pain. Also, your "new" AU has already self-upgraded to this new AU build