I feel like I should know who you are

Yeah I'm randy what was your first clue

Stone cold Steve Austin? Is that you?

Pekas guide is as good as it gets for a thrower. He goes into detail about damage vs speedy vs mixed builds, and what frw to aim for on each.

this, its a tvt based char more than 1v1

Theres also a +3 throw mastery 3 socket barb helm or whatever it is on him in stash but i never bothered to jewel it

Theres not really one correct way to balance invo for throwie, as LG said peka covered like 3 different setups in his guide this should give u an idea what to aim for.
I would recommend includig a 6str GC in your build if u plan to switch over to twitch/life build at any point, since that build uses one of those.
Also depends how much stats you obtain from jewelery. If u can get like 2x 20/6/4s in your helmet it would free up invo options. You can also get -15req jewel for your gothic.
And you dont really need that many 15/7s. 100-120mana(rings and amy) is enough imho. If you're going for helmet+gothic and you have shout, i would suggest using 15/8s instead. Or maybe some 15/1-3 since we use ck's. Sigons bonus is also great with gothic setup if you dont need the cbf.
You should go for 80frw total(5penalty gothic) and experiment with adding frw if neccesary and see what u find most effective for different m/u's for yourself.