Color Neg to Pos Conversion - Blue Cast

[JLNims]

Greetings all,

I know the negative to positive conversion topic has been discussed ad-nauseam. But this is a bit different. Please stay with me on this one. I scanned the neg with a Nikon D7200 with the neg on an LED light table into Capture One version 22 (latest). Then I exported the tif to Affinity Photo for processing. Here are my first steps:

1. Bring in the color negative MF0226_Neg.png below

2. Sample the rebate color to remove the orange cast (MF0226_rebate) and create a fill layer filled with the rebate color. Then change the fill layer blend mode to divide which yields MF0226 Neg and Rebate below. The rebate has been neutralized leaving only a negative without the cast.

3. Then I use the Invert command from the Adjustment Layers which flip the neg to a pos (MF0226_Inverted).

NOW here is the problem: I have an overall blue cast that cannot be balanced out.

I did process this Ektar 100 film at home using CineStill chemistry. The chemistry was new and just mixed. I checked and rechecked my mixing volumes and temperatures - all OK.

Any ideas?