This might help some. I know they work for me. Best idea I've ever had!
https://grizzlycreeklodge.com/trap-covers/
Great information. A guy I know uses a similar system and it works well in Southern Michigan, where we have a lot of freeze and thaw conditions. What are you dying your traps white with? I have bought some white rustoleum and going to cut it with acetone to thin it out.