FSX smokers in the evening

Running FSX as a 1970 Retro sim, so pretty much all the aircraft are smokers. I noticed that during the day, the smoke displays as expected, but during my spotting activities in the FSX evening, the smoke trails display as horrific impending disaster flame trail.

Was there any smoke effect file that will not do this during the evening, or is this a limitation of FSX and/or the effects engine?

Was also wondering if there was ever a smoke gauge made that will work with AI traffic. I have tried around 3 different ones, and they work fine on the aircraft you fly, but not with AI aircraft?

Many thanks