If youll 'never' get a drop of a T1 NM thats probably always up i dont know what to tell you. You 'cant' get Nhead, 'cant' get easy mobs in abbysea, then Id expect you 'cant' get the harder mobs in abyssea. Guessing you cant get skadi or relic either at this rate.
If you 'cant' get anything from any kinda NM/Event then we cant really help you. Your going to be stuck with anwig forever.
If you mean a 21-24 hour NM, that is heavily botted, and an abjuration that was previously 800k, then yes, I decided that i was 'never' going to get that, when i had an option that was just as good in a majority of situations.
There is relic hat (5 dex) is about the easiest decent option if you do dynamis. After that skadi works very well for stacked Shark/Man Stab (dex4/agi4/atk6).
These are both fine options, but the anwig I'm using is more versatile, and does as good of a job or better than all others save for skadi on TA>MB and TA>SB and even then, thats barely an upgrade.
i'm also a taru, so i prioritize str a little more than most people. so having an extra 4 str and moving my fSTR up plus the 2% crit damage increase, to me is worth the trade off for 3agi and 4att. (and again, this is only for TA>SB + TA>MS) for the rest the anwig beats all other options.
The new dagger skill head piece looks good at first, but its really just an ohat on crack. (17acc, 5att) anwig will trump this always.