Nice work! Keep in mind, if you angle it up too high you will easily see the bar’s bottom brackets.

If you’re adding shims to only the rear mount near the silver screw it won’t need much thickness to make a decent change in the bar’s front angle. You could test it by even folding a piece of paper in half five times and slipping that in (with bar removed for safety-loosen the screw, insert shim, retighten screw).