DUST FIELDS: I've finally gotten around to checking the size, and it looks like my guesstimate was like 100% correct, so no changes needed.
PELTA/KITTEN ARCS: Also checked those, and they were pretty close to the mark. I might tweak them at some point, but since the diff is so small I'm not going to bother right now (it's a lot of hassle). Basically they are good enough. More than good enough actually - you would not be able to measure as accurately on the table.