major snipe and floppy depth screw

I am a beginning woodworker--I assume most people considering this planer are. I have used this enough that I wish I had bought the more expensive dewalt. When I plane any wood the depth screw/knob twists on it's own so I have to set up something so that does not happen. There doesn't seem to be anything to tighten to prevent this from happening. It also has major snipe. I have adjusted the in and outfeed tables very careful to be level, or have a slight drop and I always get major snipe. Perhaps an expert craftsman could adjust this to minimize the snipe, but I don't think that's the target of this type of tool (and I'm also skeptical that, for at least the exact machine that I have, that it's possible to mitigate). The snipe is enough that I have to plan to trim the last 6-9 inches of the board after planing. It's not something that can be sanded out. The positives are that, other than those major issues it does plane nicely, it's easy to use and quite simple.

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