The person to ask would be Chestaclese. Dunno what his build is but he's worlds better at throwing than Chucky (although I don't think Chucky's problem is his build so much as his apparent refusal to stop moving before throwing... it's a big accuracy penalty to throw on the move).
My current hybrid:
24/12
5 PT
4 WM
107 throwing wpf
Leaving me with enough for 8 PS, 8 IF, 4 athletics and 106 wpf for polearm.
It's really your wpf that suffers from hybrid throwing. 107 is exactly the amount I need for PT 5 with my armor (heavy kuyak, nordic warlord helm, mail mittens, mail chausses).
I do think hybrid thrower is worth it but mostly for horses. It's useful against people but accuracy is kind of a crapshoot and plate crutchers will laugh it off. Don't plan on being a hybrid thrower with less than 100 wpf in throwing unless you wear crap armor.
But it deals fantastic damage to coursers.
Miley, with that armor, would actually do well as a hybrid thrower.