I'd imagine a well pressed puck would yield near the 5% with butane afterwords. The thing is, no matter what you get in a secondary extract after first heat extracting, its pretty much garbage. I did it once, had two hits and gave it away. Weak and yucky.
I see and appreciate your experience but I feel compelled to put my own fork in the socket.
There's a good chance I won't care after the new press is operational. I do a pretty good Winnie the Pooh.
Not in a roly polly half naked hairy red shirted man way. I like to think I captured a bit of the essence of his Tao. Spent a lot of time trying to get in side his mind.
Plus I know I would eventually find a way to extract and refine it for a probably non dab use.
I shouldn't have written most of this post either.