Well, having a look at the version of mupen that i can find... i don't know if there really is something like a 'anti-ds' mupen?
Here's a summary of the 4 files I have now.... it seems someone had rr-v2 and simply renamed it to anti-ds?
Filename Notes Bytes
mupen64-rerecording.exe rr v8 740864
mupen64-rerecording-v2-reset.exe rr v2 ? 720896
mupen64-AVISplit.exe rr v8 721408
antids-mupen.exe ? 720896
Of an equal amount of bytes doesn't mean it's the same thing... but it makes it much more likely (and if the anti-ds would only be a tine change (e.g. change a number from 0 to 1) then why wouldn't all versions have it)
ps. Filenames also don't necessarily indicate the right version... all these 4 files display 'v8' in the bottom of the ROM-selection screen
edit: Nope... all versions I have are terrible from a desynch POV, I did manage to improve the first test by about a second though.... had to estimate because I didn't finish the run (it desynched way before), but I cleared the 3rd ring with a speed of 130-140 :) (instead of 115ish in the first run)
Also, Rice (1964) indeed works better, but the landing targets don't have any red in them from close up :/