all cuts depend on the stability of your work surface. If you are trying to hold the wood up and cut it at the same time, it will never be quality stuff.
You need a good work table, stops and the wood stable to make a good, solid, repeatable cuts.
For detailed stuff, I have a scrap piece of plywood on top of my work table. I then adjust the blade on the circular saw to be just a hair longer than the wood I am cutting. Set up stops and/or clams to hold the wood and go to town cutting through it.
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