LOL, scented oil is classic.... great idea.

I'm not sure why either.... especially on all 3.

5V is coming from the PC supply and tests within a few hundreths of a volt.

I think I have the right resistors, I measured them and figured they were close enough?

I'll be danged if the color codes make sense to me though. (At my best I have trouble reading those even with a magnifying glass.)