Probably a little late to this but and I use the sp8x10 tray as well with 5x7 so far so good after a few initial hiccups. What brings me to comment though is to suggest a possible light leak? I recently had one (see thread
https://www.largeformatphotography.i...le-of-negative for images) which caused a similar banding, although more apparent, it was right through the middle in both vertical and horizontal positions.
I thought it was due to development technique, the tray, etc but come to find it was a leak where the bellows attach to the front standard. I'm only using the 475ml since I was kinda lazy having it all measured for the sp445 which I also use, and to see if I could get away with it which I do heh I get good coverage even with 475ml. For agitation, I "pan for gold" the first minute then lift the long edge, same for stop and fix.
The only real consistent issue I've had with the sp8x10 tray is if I don't tilt it forward when pouring the developer in I'll get three diagonal shadow lines on the corner near the spout but if I use Tim's suggested method of raising the back end while filling I don't get that behavior.
-Sean
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