The Stomp menu takes a little getting used to but you will get the hang. If you prefer the desktop editor that is much easier.
As far as default tones, I would not use the stock settings on the amps. Instead take a look at DrToneLab's website:
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And more specifically, his "Balanced EQ" amp settings:
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I'm also a big fan of his Studio Tube DI preset here (instead of the "Low/High Cut Block" before the amp I use a HPF/LPF block after the amp with the LPF around 6.5k):
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There are loads of people, resources, and info over in this thread that can help as well:
Line 6 HX Stomp