Since you are using a DI AR, the best option is to get an adjustable gas block from Superlative Arms and use that in conjunction with your favorite gas busting CH (mine is the Armegaddon Tactical GMS-15 Gen 2). That will allow you to have the best of both worlds with a more traditional suppressor as shown here:
https://www.youtube.com/watch?v=BNWVo76DwRs And if you really want to go all out you can get an LMT Enhanced carrier, Tubbs flatwire spring, and don't run a buffer retainer for even better results.
There is basically zero reason to run the heavy and long ultra low back pressure cans (like the OSS and Nexgen) on DI ARs currently because there are better means of cutting down blow back (like the AGB), especially with most modern cans being low(er) back pressure. Instead, along with the gas block suggested above I'd recommend picking up a Dead Air Nomad (or if you are on a bit of a budget, the SIG SRD 5.56 QD) which will prove superior in just about every metric to the OSS/Nexgen.
Where ultra low back pressure cans shine is on rifles where there is way to mitigate the blowback, ex: X95, AUG, AK, G3, and so on. In those cases, from the limited testing I've seen the OSS is outperforming the Nexgen (but the only time they've gone directly head to head is a bolt gun).