Ok wait, let me enlight you guys a bit.
About dyes:
Daggers are not getting much out of STR unless they hit 70 or 90 points, which cannot bbe done w/o p2w items and high level like 87-88+.
So for PVP you can go +CON -DEX and +MEN -INT so you can stand a little longer during PVP.
The new stat was not tested yet, as far as i know, so don't know if boosting DEX is worth it. It does seems like it but no clue, cause STR 90 gives 200 crt dmg on skills + skill power 10% while DEX is dagger dmg +20% (?) and blow land rate...altho blow land rate ACTUALLY works on DEX so just having so much DEX will make ur blow land almost 100% (almost cause afaik blow land rate is capped at 90%).
About armor:
You go light. There's no heavy option UNLESS you have the new Protection set. Not because heavy is better for p.def and stats but cause of the skill they trigger. For a few seconds you will get dmg received capped to 4000. As for shield or sigil, this also depends.
First of all, sigils are 'offensive' (crt rate from sigil also increases crt rate of skills) while shield is defensive.
If you have NM shield or MJ sigil, most likely Sigil is better...BUT if you got the Shield of Revenge or Sigil of -i don't remember the name-, the shield is better due to the skill that triggers and gives you extra p.def/m.def +15%.
Dagger current situation is that only GH is playable in pvp cause he got dmg passives, but no survivability so if he can't burst he's basically useless. Not to mention that all you need is 1 tank and the dagger is worthless cause he wont do dmg on tank. Low dmg in general but most likely he wont even land skills.
So in general:
Unless you have Protection armors, go light main part + MJ heavy boots/gloves for atk spd + DC or tallum helm robe for extra p.def/m.def.
Dyes +CON +MEN for pvp.
When you get HIGH level and HIGH p2w items so you can trigger AT LEAST 70 STR, then it's worth changing setup. If you could hit 90 STR before change is ever better as you will have a huge amount of dmg boost. Also @Vladbila those boost you see are passive for all daggers. TH personal buff is on active dmg skills and 2 passives: 1 modify Bluff effect/power while the other passive counter pull/chain skills.