I have major issues with other things on LULU. Your support guy - Chris, was great. I didn't know about the chat support help - maybe it would have save two weeks of my life formatting in a template (from your site) that was set up incorrectly.
Also, the graphic interface for the book cover is small and very confusing. You have two completely different sizes to work from. One, that you download showing crop marks - and that is completely different from the one that you get online when you upload your cover. That was very confusing. And then, when I use your exact measurements to build my cover, I upload it only to find that it doesn't fit into that tiny online template. It was hard to see the crop marks, etc. (way too small) Very strange. That entire interface needs to be much larger so we can actually see the crop marks. And then, after all of that - the online proof of my cover still had white lines around the outside of the safe area -with no indication of where the crop lines were. So, add the crop marks onto your online proof so we can see just what we are getting. That part was an absolute nightmare. I still have no idea where the cover is going to print - that's why I had to order an online proof - just to see.
So in addition to making your cover templates and proofing better - check your document templates as well - because there are issues as well. I hope that helps.