I noticed there is an issue where the Extra 1000 & Extra 2500 options of this mod don't work as intended. The extra experience needed only applies once, not once per level.
Opening up the exptable.2da files, it looks like this is due to some of the math used to replace the original values. Comparing the default table to the Extra 1k and 2.5k versions, each row after the first has a static 1k or 2.5k added from the default. Each level cap is shifted the same amount, so the difference between any two levels is the same raw amount of experience (after lvl 2) as a vanilla version. See an example below, and my "fix" to increase the difference between each level the appropriate amount.
You can see what I am talking about by taking any level and substracting the level cap of the previous level to see the amount of raw experience needed to advance between them. I did this in excel, so it should be easy to replicate for the 2.5K version. I can also send over an updated 2.5K version if you'd like.