As for the "edge-long dimple", I have just posted a full recipe how to avoid the problem as post #29 on my original APUG thread.

Rafal, what is an "edge-long dimple"? I dry mount MGIV FB double-weight paper in large sizes (11"x14" and 16"x20") and I don't see a problem, but I may not know what I'm looking for/at!