Nice results! Including the firework shots!
Yes, I also struggle with those thin sheets of film, especially when pulling them out of the BTZS tubes, unless I pre-wash prior to development, before inserting into the tubes. Then they slide out quite easy. The first box I ever got many moons ago, I accidentally loaded two sheets together on one side. The stuff is so thin! And to make matters worse as I progressed through the box, the notch codes became less and less until nothing! Thankfully, I haven't had that happen since!