I'm sorry I have very limited time today so I'll make this brief. When you ran the FocusOffsets.vbs script back in 2019 you told it to use filter 3 (0-based, which is filter 4 in MaxIm 1-based) for the reference filter. I'm sorry it's not clear that, once you set up focus offsets, that filter number in ACP Preferences is overridden.

Snap1.png


Per your image from this post, blue is #4 and your FilterInfo.txt file lists that filter (#3 0-based) as reference. This is why ACP is focusing using blue.

; FilterInfo created by FocusOffsets.vbs
; 10-Aug-19
; offset,ref-filt,ptg-filt,af-minmag,af-maxmag
137,3,3,7,9
26,3,3,7,9
-67,3,3,7,9
0,3,3,7,9
-36,3,3,2,4
145,3,3,2,4
-24,3,3,2,4

Your best course of action is to re-do your FilterInfo using the Focusffsets.vbs script. When you run it, it will ask you "Reference filter number (0-based, see list below):" and give you a list of filters by number 0-based. Choose 0 for Luminance or 1 for Red. Then let it go.

Here's a map to the details.

Snap2.png


Once you have FocusMax focusing through Luminance or Red, you should get better plate solving reliability.