are supplementary exercises needed...right now, i do interval sprints, pushups, pull ups, etc. after my boxing workouts. but wouldnt it be better if I did extra heavybag sets or extra shadowboxing rounds instead of doing the things above?

like instead of doing clap pushups for explosiveness, i can do an extra set or two on the heavybag and focus on the speed.

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There's really no way to answer this question. Your body needs to be as strong as you can make it, but you also need to hone your technique. This is why a lot of us train for 2 hours a day, plus morning roadwork, plus quick sets of exercises during the day. You need to do it all.

You lift weights? You should if you don't; espeically train your legs and core for more punching power.

yes, weightlifting is good. The amateur game is a lot more focused on power than you might think, its not that hard to hurt people in it an allow for more points to be scored..