I'm glad you bring up this evidence. As the plate moved over the top of the hotspot, as you point out, a volcanic eruption ensued. The more time a plate sits over the hotspot, the larger the resulting island. In my paradigm, the movement of the plates has decayed asymptotically toward zero, according to the Second Law. Thus, when the plate moved rapidly, the resulting island was very small because the plate's time over the hotspot was brief. As the plate slowed down, the islands got larger and larger. Now that the plate has come to rest, the Big Island of Hawaii is by far the largest volcanic island because it sits over the hotspot to this day. Thus, the evidence of the Hawaiian island chain is wonderful proof of catastrophism.
If uniformitarianism were true, then if the plate were moving at a constant rate, then the hotspot would be getting more intense over time rather than less. This would violate the 2nd Law.
[As a disclaimer, the hotspot theory is not universally recognized as true, but for purposes of this post, I assume it's true.]