Re: Printing on dvd problem
Assuming that the original images are perfectly central, it looks like the problem occurs at 2 levels.
First of all there's the offset, that causes the different amounts unprinted when comparing the side and the top. Secondly there's the amount allowed for "bleed", which is effectively how close to the edge of the disk you want to get.
Both these should be adjustable in the software, but I'm not familiar with the software you are using so I can't tell you where to look. If they aren't adjustable then you should probably try different software.
In any case, this is a software issue rather than hardware. I'll move it to that section so you have a better chance of getting the answers you need.
Re: Printing on dvd problem