Your problem is that there's two patches for the legend of zelda; the one with the expanded rom (is the one with the videos) is not here on this site!
The one you are using the DX (is in this site) you don't need to expand anything, If you still have problems I can give you my working folders, for the two legend of zelda MSU1.
BTW asides from the videos and played both, I think The DX have a better sound track and is the one to go.
On other notes the megaman X3 MSU1, posted in this site is incomplete and you can't make it to work, since there's no "mmx3_msu1.msu" file.
Since is and empty file, I used the one for MMX changed the name and It worked.
The quality varies from hack to hack, you can get gorgeous ones or a really bad ones.
Speaking of others MSU1 hacks, there's a DKC2 IMO is perfect, a Super Mario World that quite frankly is terrible! the top gear 2 that in real hardware the soundtrack is way off, but works like charm in emulators, a Beta for secret of mana
(wich I hope vivify93 can make it to work with is VWF expanded dialogue) and a Chrono trigger beta that plays the psx video .
And I agree with you; most of the notes are incomplete and is incredible hard to make it work.