How long is the whole show and the two segment seperatly? How big are the rendered DVDA mpg2 files? You can only put about 4.7 GB on each DVD, otherwise you have to compress.
As to why you get stuck at 91%, I do not know, but you may experiment by eliminating some segments in the credit section.
I routinly make DVDs from the Canon HG10, AVCHD with no problems.
jk