QuarkStar

I'm having trouble getting the colors quite right with this mod: If I get the whites looking good then the yellows are a completely washed out tan-brown; conversely, if I get the yellows looking nice by turning up the blue-difference potentiometer, then the whites invariably end up in some range of yellow to green. I have yet to find a decent compromise. Note: I had to get the blue potentiometer up fairly high to get most of the colors to pop, but I can't really increase it further without turning the blacks into a bright blue; they're already a little bluer than they should be but still look alright. I tried several times following Harvey's guide on adjusting the colors, but no luck. Any recommendations on how to fix this?

If there are any more boards available I would love to purchase one