First of all, Alex, I'm with you. Bring back Grade 3 Kentona!!! Even so, I love grade two.
I have never experienced the "yellow". I use it with MAS Amidol (LOTS of KBR) and Ansco 130. I also use distilled water.
I'm guessing Michael is correct, I never develop it (with Amidol) for less than 2 minutes.
Edit: Looks like you figured it out already...