Jim, I find the same thing with spares, in that they don't soak up much foiling liquid flavor. I suppose it's just the nature of such a rich cut of meat, but maybe try some hooch of some sort with some loinbacks? I know that the flavor that Chris Lilly's pineapple sweet ribs soak up from the apricot nectar, PA juice, and the garlic, is one of the reasons I'm all for foiling loinbacks, not just the tenderness and moisture retention.
Anyhow, fantastic looking ribs, and I bet they tasted fantastic, as well. The steamy shots on the grill should be published somewhere!
Jim - you have a lot of great cooks here - must say these ribs look like some of the very best. Interesting Apple Pie addition there too!! Pull back on the bones looks perfect... Well done Mr. Lampe!