I've been throwing tomahawks in my backyard for maybe two years now. Like anything else, you have to find the technique that is natural for you. I've read and watched many tutorials, but ultimately my way of doing it doesn't exactly match any instruction I've seen. I also alternate and try new things from time to time. For me, a throw that goes as a slight angle (roughly from shoulder to opposite hip) works best for me. Not directly overhand, but not a side throw either (parallels to slinging?
). I've experimented with throwing from the opposite foot forward (I throw right handed, so left foot forward), as well as the other way with same foot forward as my weapon hand. I feel like I do pretty good either way, with enough practice. I don't see a clear difference in performance, but maybe that's just me.
Long story short, one's ideal throw is an individual thing (again, parallels to slinging?
).