"
It doesn't seem logical that manufacturers would list an acceptable temperature range to 80 degrees without a disclaimer noting that significant of a drop in switching capacity."
They do. You need to check the spec sheet for your SSR. Some disguise the data in charts and some just flat hide it or don't mention it. Some don't mention the fact that SSR's used to switch heaters should be de-rated to 75% either. I could care less if folks don't want to run heat sinks. I'm just stating my observations and trying to save some grief for a few. Use the data or not. Better still, do your own research.
Here's a couple of samples.
