Maybe it's my imagination, but the black color Senco's do not seem as durable. Lately its my go to color and they seem to tear in half where the hook goes in after one or two fish. I also fish the green pumpkin and they seem to be twice as durable. Any one else notice this or is it just me?

Not really... I will say this though that if your using Yamamoto senkos they are very susceptible to getting soggy from heat and moisture due to the very high salt content. If you put a damp one back in the package this will happen. Around Florida with this heat and sun they don't hold up well either.Packages must be sealed tight always and not left in the sun. Also just to theorize,since the color black absorbs the most light and gets very hot in the sun it may have something to do with it. My junebugs also get that way pretty often as well.

I have been wondering about this for awhile - it seems like all colors are not created equal.  The fall rates can be different, the action can be different and the durablility can be different.  I have noticed this not only with Senko's but with other plastics as well - I wondered if it had to do with the chemicals or the proportions or something.  Not worth losing sleep over, but interesting.

Yep that too. The chemicals used in coloring it or how well it is mixed. For instance there are a lot of zoom colors I noticed that have varying degrees of durability.