Are all 30 managed using Frontpage? You may want to look into other programs that are more standards-friendly than Micro$oft. For example, Nvu may help you out. It is similar to FP, so there won't be as much of a learning curve. And the best part of all...it's FREE!
I've used FP in the past, but mainly as a learning device to learn HTML and how web pages are created and developed. Once I felt kinda comfortable, I dropped it in favor of other applications that work just as good, but adhere to W3C standards. While I didn't have as many sites as you, I don't recall having any major issues while I was using FP. As previously mentioned, describe the problems you're having for us...there may be someone else out there who has had the same thing happen to them.