I can capture my THX 1138 LD when my Panasonic LX-900 gets back from the shop.

I use a 2D adaptive comb filter made by Faroudja: the VP-100. It has a chroma delay adjustment that I use to correct an ~1px chroma delay inherent to all LX-900s.

Two LX-900 => VP-100 captures averaged together exhibit no dot crawl and rainbowing whatsoever! It looks like I passed the LX-900 through the most advanced 3D comb filter in the world except it's artifact-free!

I know this is BigTalk™, but I can post some samples tonight to backup my statements, if you'd like.