For me, I think the balance is at 56-57F for a total of 48hrs contact time. After I soft crash to 50 for 36hrs, I will gently let it rise to 56. Then I measure my DHs out and put them in a tupperware container to warm up to room temps for about 1hr. If Im using a whole 2oz pack, Ill keep it sealed in its bag. I feel like letting the hops warm to room temp facilitates them breaking to pieces easier once you put them in. I've also moved to ONE DH lately which Im actually liking but Ive also limited my DH to 6-10oz depending on the strength of the beer.
While DHing at 56F and letting the hops warm up to room temp, I do get a nice carpet of hops all broken up at the top of the beer (you will get some that sink). The hop "carpet" will drop out slowly over about 24 or so hrs. I start to cold crash at 24hrs post DH so that Im kegging 24hrs after that. This is what Im currently doing and been loving the results. Although its not a NEIPA, but my Double west coast style IPA had 8oz of hops (some of that was columbus and citra lupomax) and this beers aroma is easily one of the most pleasantly potent that I have had in quite some time.
EDIT: I will edit this to say that DH process is important here (especially limiting O2), I think the hop quality is also critical. SO its difficult to tease out DH process vs hop quality if both are good.