Thanks Elise! yes he has never surfed yellow after a bounce. usually red/pink. so that was a positive. Might start with a Fat 2, as 2.25 is hard to dose and I suspect I was giving him closer to 2.5 than 2.25 before anyway.
Also the last few days I used different syringes I had from before that were whole unit only since I was given even dose but they might have been off by a drop or too which is causing the yellow.
Tomorrow I plan on using my new box of half-unit syringes.