Feel like I'm piling on questions in this thread, but I don't care haha.
I've always wondered about leg press (machine), whether it's a mistake supporting your thighs and knees. Not sure if this is understandable, but say I put 150 on it's very easy if I rest my hands on my upper knees/lower thighs. To be honest when I do that I can max the machine on sets pretty easily, but if I hold the bars next to the machine (which is indicated on the manual demo sheet), that's not possible at all.
I also wondered how much angle you should have on it. I have toothpick legs so I can maximise the angle and have a pretty insane length of movement, but that makes it really REALLY heavy, and I think it might be a bit iffy in terms of getting injured.