A friend of mine uses latpulls to increase his chinup ability, volume was what worked for him, so he does something like
3x1 chinups
5x5 negatives
3-5 sets to failure on a latpull-machine, using different grips
This would be his pulling workout for that day, after squats and bench or press.
Volume seems to be a good idea here, but working up to a chinup at +300lbs will be pretty hard. If you lose weight and work on latpulls, negatives, maybe row-stuff or curls, this should work.

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