I finally figured it out, browsing the vcdrhelp forums it came to my attention that most 4.7gb dvd-r's actually only hold like 4.38gb or something like that. That particular disc has 4 episodes on it compared to 3 on the other 3 discs, so I tried it again using dvdshrink and just compressed it a little further and voila!
Thx for the reply tho.