1. Yes, any aftermarket trigger will eliminate the side-load issue.
2. Can't help on the mag's, but the problem likely isn't with the mag but the fact that it's a push-feed rifle. If it feeds well normally (when you're not rushing like you were in the video for a timed match) I would say the mag is fine and it's something you are inducing as the shooter. Canting the rifle severely can/will affect feeding reliability with a push-feed.
My suggestion would be to practice like your in a match and when the rifle jambs up stop immediately and look at how it's jamming. Is the bullet tip hitting above or below the chamber mouth? Off to either side of the chamber mouth? Is the bullet started into the chamber but the shoulder is jamming on the chamber mouth? Is the shoulder making it into the chamber but it jams on the body of the case because the case head isn't lined up with the bolt head and caused it to get wedged?
Knowing specifically how it's jamming will go a long way into knowing what the cause is and what needs done to fix it.
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