Quote Originally Posted by Alan9940 View Post
Steven, my immediate guess is that it's the lugs on the SP-445 holders. Lots of folks, including me, have reported issues of the lugs gouging the emulsion. I have sanded the corners, etc, of the lugs on my v3 holders, but still get marks on my film. My v1 holders, so far, work without issue. To be honest, I have stopped using the SP-445 for any serious work.
I am starting to come to that conclusion. I was looking at this https://www.bhphotovideo.com/c/produ...Film_Drum.html and I am considering going to tray development.

It is a lot of work to get that annoying streak out. It must be the way the liquid enters and exits the tank or swirls around. I think for my next try with the tank, I am going to vigorously agitate for 1 minute, then agitate as usual. I also thought about semi stand to stand development as well after vigorous agitation.