However, the skills to not multiply past the initial skill point invested. The bonus is always 2%.

Okay, two things to do to make this work.

1) In the affix editor, You need to set LINEAR_GRAPH or MASTERY_GRAPH as the graph override for the effect you're using.  Linear = 1*AFFIXLEVEL.  Mastery = 4*AFFIXLEVEL.  You can adjust these with STATPERCENT.
2) In the skill editor, set the Affix Level for each level of the affix.  So, first rank = affix level 1, second rank = affix level 2 and so on.

--I want the skill to always require level 100, so after the first skill point invested, the next required level remains 100, not 101. How?

Is your level requirement set using a SKILL REQUIREMENT GRAPH?  Or is it set using the REQUIRED LEVEL setting?  I've always used the graph, so I assumed REQUIRED LEVEL wouldn't increment.  If it is incrementing, try setting the REQUIRED LEVEL at the LEVEL rather than the SKILL for each rank of the skill.  Since you're setting variables for 20 levels of each skill, might I suggest thePMPE?

And a video on how to use it:

Well, it is in Beta now. It works as far as I know.

Figured I would upload it here since you all gave most valuable help.

I will make another post for the next modding project.

Thanks again!

Bill