Hi, a beginner type designer here.
I'm making a sans-serif typeface that I wish to work well on body text, but also to have enough interest as a display typeface. I'm aiming for some sort of "hand-lettered" feel. My starting point was /Q, that took its shape from a letter drawn on a chalkboard by one of my math teachers. After drawing a few more of the capital letters it started to look like something from an old tin can or something, at least in my mind.

That's why I gave it a name "Le Sardino".
I have two masters, thinner "regular" and heavy. I have been test driving it on screen for a while now, and I'm becoming quite blind to its flaws. What should be improved?

Screenshot from Wikipedia. (The slanted version is created by the browser, I have no slanted master.)
EDIT: I added "Type Design Critiques" tag to this post, but it's showing up in "Type Design Software". Any help?

Comments
Labels: Your regular is more of a Light weight, and your heavy more of a Semibold. This is not a big deal, but it is better to label your weights in line with typographic norms. It also gives you room to expand the range later if you wish.
There are two biggest optical issues about stroke weight at the moment.
First, it seems like maybe you have made the horizontal and vertical stroke thicknesses mathematically the same. This is a problem because it LOOKS like your horizontals are heavier than your verticals as a result.
Second, you need to have at least a little thinning where a stroke splits off from another, otherwise it looks bolder at that intersection!
You will find these and some other issues covered in various places, but this video of mine covers these most obvious problems you are currently facing, plus some others you may find helpful:
D could be more wider but it can be a style preference specially for you
8 needs to be wider specially at the thin size, ( not that much)
and i would like to say that e, c and s looks really great (talking about curves and proportion but it's missing optical compensation for sure)
Hope that it helps, but take my comments with a grain of salt, i'm a novice in type design trying to become a professional