I suck with a metronome

When you get good with the metronome, try muting it for a measure and see if you can come in tight again
All you can do is practice, practice and practice. Start using really low tempo like 60bpm and work your way up in steps of 5. I know a lot will probably comment that's too low to start with, but that's a first hand recommendation from Guthrie Govan himself. Like he said: it's harder keeping a steady low tempo than a higher one.
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