Translating Hebrews 8:6

I've always found the NWT rendering of Heb. 8:6 quite interesting from a theological perspective. It reads (1984):

"But now [Jesus] has obtained a more excellent public service, so that he is also the mediator of a correspondingly better covenant, which has been legally established [NENOMOQETHTAI] upon better promises."

Under the entry NOMOQETEW, BDAG has: "to enact on the basis of a legal sanction, ordain, found by law . . . a covenant which has been (legally) enacted on the basis of better promises Hb 8:6 . . ."

Here is how some other translations handle NOMOQETEW in Heb 8:6:

"But now He has obtained a more excellent ministry, inasmuch as He is also Mediator of a better covenant, which was established on better promises" (NKJV).

"But now He has obtained a more excellent ministry, by as much as He is also the mediator of a better covenant, which has been enacted on better promises" (NASB).

"But as it is, Christ has obtained a ministry which is
as much more excellent than the old as the covenant he
mediates is better, since it is enacted on better
promises" (RSV).

"But now hath he obtained a more excellent ministry,
by how much also he is the mediator of a better
covenant, which was established upon better promises"
(Webster).

"But now hath he obtained a ministry the more
excellent, by so much as he is also the mediator of a
better covenant, which hath been enacted upon better
promises" (ASV).

"But the ministry Jesus has received is as superior to
theirs as the covenant of which he is mediator is
superior to the old one, and it is founded on better
promises" (NIV).

"But now he has got a more excellent ministry, by so
much as he is mediator of a better covenant, which is
established on the footing of better promises"
(Darby).

"as it is, he has been given a ministry as far
superior as is the covenant of which he is the
mediator, which is founded on better promises" (NJB).

"But now Jesus has obtained a more excellent ministry because he
is also the mediator of a correspondingly better covenant,
which has been legally established on better promises" (NWT 2013).