Yellow/orange, red/orange, green, yellow and red are all bad colors unfortunately. Strong colors with strong contrast is best. BUT again for me I do understand everything ur trying to point out..Yeah, that thought occurred to me midway through making it originally. An understandable downside to otherwise-useful color codes.
The current colors are, top to bottom, green (Hex #87AE6C); yellow (Hex #E1BA59); yellow-orange (Hex #D38A59); red-orange (Hex #F66C15).
If you can suggest four colors with better contrast, ideally ones that can still be placed in a logical order, I could give it a try.
I think it’s something like 8% of men are color blind so I wouldn’t worry to much about fixing it as uve already put a lot of work into it.