Rustoluem - color vs drying time?

Has anyone noticed if the Rustoleum brand oil based paint (brush-on from the can) has changed with respect to the drying time of certain colors? Unless my imagination is playing tricks on me it just seems like certain colors are taking much longer to dry. I’m aware that different pigments affect drying times differently. Quite often when I restore old woodworking and metalworking machinery I will finish the machine off with the Rustoleum brand paint in a can and brush it on with a good brush. The product ‘levels’ VERY well and if I use a good brush and paint carefully I will see no remants of brush marks in the paint.

However recently I found myself remarking out loud that when using certain colors, “Forest Green” in particular, the drying time is just awful. I’ve used that green color many times and it’s not uncommon for the paint, either on top of clean non-rusty non-oily acetone-prep’d metal or primed wood to take up to 3 or more days to dry. And in my same dry, non-humid, heated, basement workshop I find the gray paint (brush on) can dry, at least, to the touch in only 10 hours (+/-).

I wonder if the green pigment in that particular paint has changed over the course of time? I also noticed that that particular color green seems to be more susceptible to runs when brushing, more so than before, especially on vertical surfaces. I used to be quite please with the product but now I’m losing my faith in it. I’ve had a friend mention to me that they’ve experienced the same thing also. Has anyone else seen any noticeable change in drying time with this particular brand paint?
Eddie