I think a general warming filter, like the KR6, would go a long way towards fixing this. When you say "poor & downright awful", what exactly do you mean? Since these are totally subjective terms it's not very descriptive of your problem.

I recall being kinda surprised at how blue some slides I took turned out. It was overcast, so similar conditions. My theory is that if something's blue, make it a bit more yellow, if it's too yellow, make it a bit blue. Moving towards the right color, even a little, will make it look better.