Hello and thanks a lot for your helpful critique!

Yup, balancing out patience and overdoing it (for example when I ghost the same line for the 20th time my hand and mind start shooting errors at me) is quite the challenge, so far I do a couple ghosted lines (like 10 at max but I try not to count it) and either commit to the stroke or give the hand a 1-3 second rest where I relax all the muscles of my arm and repeat the process. I'll also start doing hand/arm warm-ups before each session and see how that goes, and if that won't work out, I'll try drawing after working out.

Regarding speed, I'm experimenting with that a lot, both when ghosting and striking the lines. Just as you say though, higher speed has a better chance of being nice and straight in my current situation. Sometimes I do it too fast and the line looks just as slacked-off as the slow wobbly ones haha. It's gonna be fun to see how flexible one can get regarding confident lines no matter the speed, I didn't actually know this so thank you for the "future insight"!

I do tend to have lines/ellipses shorter/smaller than the destination rather than overshooting it, huh. I'll try countering it with overshooting it then and hope the same logic as with lines that curve in only one direction works here.

Regarding Organic Perspective, I can see that now, thank you. I was very focused on getting the hang of this one type of box instead of adding more variety, so I'll work on that during the 250 boxes challenge along with the warm-up drawing exercises.