This is a bit of a mess-about project (I'm calling it Plastic Wrap) but I can't seem to get it looking how I want - I keep slanting some of the letters backwards and forwards to try to get them to visually agree but I can't tell if I have it right or not. For example, in my perception, the tail of the /q looks more upright than the /l, even though they are parallel. Similarly for /u/l. I don't know if it's a matter of making corrections for longer slanted lines versus shorter slanted ones, but I am struggling to work out how to do it without bringing the whole system crashing down.

Any other advice would be appreciated too, of course. (I know that I need to kill that darling of a /g. But it's so
fun.)
Comments
Reminds me of my Wozom (unpublished). I ran in the exact same problems ten years ago when I had far less skill (and that's why it never got finished
Working for a long time on italics tends to make everything appear skewed. If you shift your gaze to your keyboard, the keys may appear rhombic and your monitor - slanted. A way around this problem are the tried and true flip horizontal and flip vertical. You will be able to immediately see the problems I listed if you print out a mirror image of the font, and then an inverse mirror image, and you look at the prints from all four sides. This method never failed me. Think of the story Chuck Norris related in his autobiography about a fight in which there was a judge at every corner of the dojo. He won that one!
Longer italic glyphs DO appear more slanted than shorter ones, so your eyegauge has to correct the slant manually, and it is trained with time and the flip method.
Your "g" just needs an ear to be fine.
As for numeric indecision in type design, here's the rule I recommend:
BTW, I think the "v" is slightly wide.