It's possible you missed the krausen entirely. This one takes off like a rocket. The 3787/530 is a much slower fermenter.
Ah, I hadn't considered that. It was only 2.5 gallon batch... I forgot to mention that i brewed in the morning and before I went to bed it did have some krausen. Next morning it was gone. Only 1/2 inch ring around the carboy above the surface. Clearly it was active early in but quickly settled down after only a couple of days.