The problem is, we are not sure the -0 is a "good" one. The problem started showing up shortly after the -3 update, that much is true, but we are not sure if releasing -0 as -4 would fix the issue.
Furthermore, if we wanted to release -0 VPS again, it would have to be processed by all the common processes. And if those processes released the faulty (if it is caused by it at all) -3 VPS, how can we be sure that the -4 will not be faulty as well?
To put it simply, we have to make sure the new VPS is perfect before releasing it. Thank you for your patience!