With Meta rolling out different Quest OS updates to users, it's difficult to recommend one setting that'll work well. I'd recommend bumping up the refresh rate in the advanced video settings to 120hz, though. Adjust the sharpen setting to your liking, then maybe increase the resolution if you're able to maintain 120fps.
Near the top left of the SMB menu, there's a star icon. Click on it, then add a bookmark. It'll save your credentials, so you can click on the bookmark to load the SMB share without the need to re-enter your credentials.