Excellent work. Superb growing of a somewhat sensitive species.
If you wouldn't mind joining me in an "experiment". This growing season, plant one of your offsets (Pinguicula rotundiflora) in a pot topped with a 1/4 - 1/2 inch layer of 1:1 vermiculite:coral, about 1/8 inch size pieces and smaller. Let us know how this does.