A couple initial thoughts:

-Your version of DRK has zero enmity combos until 38. your DRK would be extremely hard pressed to hold aggro on single target against the dps that start getting their 3rd tier combos around the 25 level range. You also don't have increased enmity on Unleash, so your DRK's aoe aggro gen will be horrendously bad until 56 (and hilariously bad at level 50 dungeons as a result) when unmend strikes all targets nearby.

-Tying debuffs to enmity combo is just creating Heavensward WAR memes all over again (where WARs would ignore path in favour of BB'ing due to higher dps gain). And just like WAR memes, giving any tank a % damage down on enemy attacks that's based on their GCD is just asking to create "storm's path 2: electric boogaloo" in how mandatory it'd be in progression (to put it in perspective, your cow the guilty would neuter every raid buster in Ultimate). Also, nullified Crit chance from enemies is insanely overpowered. That weaponskill would instantly obsolete Awareness. and that 20% vuln on quietus is just way too much, as raid dps buffs on a tank is just asking for unbalanced problems.

If you're insistent on giving the enmity combo debuffs, they need to affect the DRK <ONLY>, to prevent the DRK from using them as an OT.

-Honestly speaking, your DRK looks like it'd be fun to play only half the time. Putting so much emphasis on being the MT and wanting to get hit creates a job that feels bad when you get 2x DRK or there's forced tank swaps for long periods of time and thus you're potentially forced to not be tanking the boss and lose a lot of fun out of your kit.