Sure - I've attached a screenshot showing essentially what I would want the "X" for example to look like. What you see is a result of creating a rectangle with an 80px wide stem (same as rest of font), using Pythagorean theorem to calculate length needed to span standard character width once rotated (all characters except "I" and "W" are 725px with 90px spacing on either side, spacing will obviously be tweaked later) and using rotate tool to rotate stem counter-clockwise until roughly hitting cap height (x-height for my all cap font), baseline and width guides. I then duplicated and mirrored the stem so that both stems cross in the exact center (what I meant by "symmetrical"). I added the 30px rounded corner radius after rotating to avoid distortion (although in the future, parameters seems like the right way to go with filters).
The problem is that even though this is close to what I want, the edges of the characters are not perfectly aligned with the baseline, cap-height or guidelines for width. I need everything within the bounds of the other characters in the font and I'm not sure how to accomplish this. Needing the corners rounded complicates the measurements needed for everything to fit within set boundaries. Does this make sense?