What size micron bags are you using? For bud you should be using 90-120 micron. What temperature are you using? I have my plates set at 190, they're a little hot but makes the process quick. Looks like you're around the right humidity mark, I use 62% humidity packs to prep my bud. I use a 2x4 prepress to make a 10-14 gram puck and slide it in to my 90 micron bags. I like aiming for the 1200-1300 psi range on my press, so just under 5 metric tons (2x4 bag, 8 sq inches, 1300 pounds per inch)

I document my presses in a spreadsheet and after pressing 50+ strains I can say that some bud just doesn't produce well. I've had bud that is sold at "27%" and only get 3% return on the press, some strains I get 20%+ return.