Sorry for the necro-reply, but I found the source of the problem and have a tentative solution (so far only tested at level 1). The solution is technical and intended for those who are comfortable with modding "the old-fashioned way". I have no experience with creating or altering WeiDU installs...go bug the tutufix people for that.
First, the problem: The nice people who gave us the Totemic Druid rebalance are trying to use files that they failed to include in the distribution. Specifically, they altered SPCL621.SPL to use SPIRSUM1/2/3.EFF as well as the original SPIRSUMM.EFF, but neglected to include the first three. What's more, they gave you an incorrect version of SPIRSUMM.EFF, so even when you
do get it at level 10, it'll be
weaker than the unmodified version! As the poster above said, clearly the testing on this particular "fix" was...non-existent.
The solution(s): Well, the most obvious solution is to uninstall the rebalance, but assuming you don't want to do that, the more detailed solution (as I said, so far, I've only tried it at level 1) is to go into your BG1Tutu\override folder and create copies of SPIRSUMM.EFF as SPIRSUM1.EFF, SPIRSUM2.EFF, and SPIRSUM3.EFF. Then use Near Infinity (or a hex editor if you're feeling adventurous) to alter
all four of the files so that the "Resource" entry points to the .2DA file with the same name. In other words, SPIRSUM1.EFF should point to SPIRSUM1.2DA (or just "spirsum1" at offset 0x30 if you're hex editing) and the same for for 2 and 3. To fix the weaker version, you also have to modify SPIRSUMM.EFF so that it points to SPIRSUMM.2DA instead of SPIRSUM3.2DA.
There, wasn't that fun?
Edit: Looking at the WeiDU install script, it looks like that's where the problem lies. It was
supposed to create the appropriate files based on the original SPIRSUMM.EFF, but instead of creating copies, it redundantly re-creates and modifies SPIRSUMM.EFF 3 times.