SCCM Distribution Slow? BITS disabled, bandwidth unlimited, regular file transfer is fast

Hello,
I have noticed that when I'm distributing large files (Operating System Images) to our on-site distribution points, the file transfers have been taking a substantial amount of time. Using resource monitor and task manager, the transfer is happening at less
than 100Mb/s on our Gigabit network. However, when I do a normal file transfer between the site server and distribution point using Explorer, the transfer maxes out the connection at 970-987Mb/s.
I have confirmed that BITS is disabled for all my distribution points, maximum threads per package was increased to 500 with no performance increase, and Client Computer Communication under site properties is set to HTTPS or HTTP (distribution points set
to HTTP).
Setup:
Site Server - Server 2012
3 Distribution Points (On-site) - Server 2012
I did a lot of research online the past few days and didn't find anything relating to my issue, nor any solutions resolving this slow transfer. Is there something I'm not understanding correctly or may I have a setting wrong?

BITS is not used when transferring content to DPs (unless you are using pull DPs).
Have you alreada checked if the transfer to those DPs is throttled (can be found in the properties of each remote DP)?
Also monitor distmgr.log and pkgtransfermgr.log.
The 'Rate Limits' tab on each distribution point's properties page is set to unlimited. The only thing I can think of is the environment was setup in our old building (just built a new headquarters) on a 100Mbit connection, but the new building now has gigabit.
distmgr.log and pkgtransfermgr.log doesn't really give me any indicators of what would be causing it to be slow. :\
Should I open a premiere ticket?

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