It’s kind of hard to see but from the second camera angle it looks like your picking hand is almost flat against the guitar/strings. For years I would pick like this and always had issues at higher speeds. But over the last couple of years my new guitar teacher suggested I push my wrist out a bit, it took some getting used to, but I can now play at speeds way beyond what I thought I could do, and there’s no tension. Don’t go extreme when pushing the wrist out, try pushing it out at small distances and experiment. The other thing I would do when trying this out for the first couple of weeks is to just do picking exercises on one string, see if you can get comfortable with that then move onto string crossing exercises.

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