I am beginning to wonder if some of this due to, or at least aggravated by the new phthalate free or compliant formulations. I do know that I was told by one rep of mine, that he'd rather send gallon samples of some Rutland whites because quarts are very susceptible to temperature effects, and he wanted to show them in the best light.
And, btw, both the cotton and low bleed Streetfighters were pretty thick.
But no, I've never heard of them setting up like you described.
sweetts, talk to an IC tech.