I agree to use a longer development time, with the appropriately more dilute developer. I experienced streaking when reducing my development times to control contrast, using BTZS tubes. I was developing between 4 and 5 minutes with D-76 1:1. I have changed to D-76 1:3 and processing around 11 minutes with Tri-X at 70 deg F. No streaks so far using the longer process time and more dilute developer.