I went through a period where I woudn't shoot skies, for the same reason, blotching. There aren't many options for xray, you have to be so careful not to scratch. I bought a mod54 out of desperation, still was no good for xray, so I made a few mods on it.
Now it occasionaly drops a sheet, but is generally pretty good. Funny thing is, as I told you, I develop 8x10 in tray and its no problem, have just finished doing five and all turned out well.
Seems you are getting the knack though, only one reject, the other two look ok. Great work on the vanity, Your craftsmanship is evident.