have you tried lower temps?I found 185 is best for keif with out buddering up.
Maybe I'm doing it wrong, but my rosin doesnt look anything like the pic you posted. Im pulling extracts from the bubble hash and getting a thick honey like rosin, then I chuck the pressed puck of hash in the trash.
I actually lifted it from an old electric lawn mower out in the garage. It was a plastic knob that had a steel nut snapped inside. I just popped the nut out & hacksawed slits for the little bar across the release valve. It fit better than I imagined..Yeah, the bar sucks for that. Where did you source the knob from?