Cannon main pvp formation

[Shiroyasha]

My formation right now is as this:
:exo::bst::vik:
:gun::malehero::gun:
:mnk::ora::pro:

im currently lvl 82 and what i want my formation to look later on is this:

:exo::spt::vik:
:jan::malehero::jan:
:mnk::ora:hwarang

do you have any advices? main purpose is stunning/seth will in the middle row
also, in the few first rounds of pvp my cannon can frontline instead of exo

[Locksley]

seth is fail at lvl 100+ unless you have druid to BS. even then, its not a good tactic unless you are overgeared compared to your opponent.

Build is ok, but not so much the "tactics".