Hello,
Welcome to PPG!
Now, the hard part: I'm not sure that you followed the instructions just as they were supposed to be followed. You see, with BG1 Tutu v4, here's the (normal, as I see it) order:
- if you want to play Tutu with some mods for Tutu as Bg1 Unfinished Business (or, say, BG1 NPC, which I can heartily recommend, or BG2 Tweaks, or some other), here's what you do:
- you install a clean copy of BG1, no Tutu mods. No Weidu.log!
- you install a clean copy of BG2, patched, no BG2 or Tutu mods. No Weidu.log!
Then you install Tutu. You now have a Tutu directory.
(Then, as I recommend it, and, mind you, it's only a recommendation of mine, you backup your whole override directory, your bgmain.exe, your baldur.ini, chitin.key and dialog.tlk. This way, if your mods go wrong, re-installation will be fast: delete weidu.log and override and all mod dirs, and unpack your backups).
In your Tutu directory, install your chosen mods. In your case, tutufix, BG2 tweaks, Sword and Fist, BG1 UB. And you're right: if there's a chance Kivan and Tazok may be relevant to your problem, do not install this component.
Then and only then, play.
I think that installing BG1 UB on BG1 instead of installing BG1 UB on Tutu may be a cause of your crash. I cannot be entirely sure, though - sorry! But it is worth a try.