I need some advice for inlay preparations on typodont teeth trouble

I’ve been having trouble with crown and inlay preparations on typodont teeth. Specifically, I struggle with getting the walls of my prep parallel or convergent with the long axis of the tooth. Whether I’m working on the mandible or maxilla, I find that my prep walls tend to lean toward one quadrant.

For example, when working on incisors, I often end up with either the buccal or lingual wall being too convergent while the other is divergent or too straight. I think the problem comes from not properly angling my bur.

Also, does anyone have tips for interproximal reduction without damaging adjacent teeth and still leaving a clean finish line? Any advice would be greatly appreciated!