Encore CS6 Blue Ray Burning problem

I am writing because I have a question that perhaps you someone can answer. Here's the scenario:

I use the Adobe CC suite on a fast, fully-loaded late 2015 iMac. I've assembled 10 videos in H.264 format using Premiere Pro. Most of the movies are about 3-5 minutes long. Two of them are roughly 23 minutes long. I want to ultimately put them on a Blu-Ray disc with 2 menus created in Photoshop. Although Blu-Ray burning has become increasingly less popular, I find that even with the fastest internet speeds, there's always a delay showing movies via computer to Apple TV or directly connecting to TV via a long HDMI cord. I love the crisp, clean non-compressed look of Blu-Ray and the ease of popping it into the player and jumping from movie to movie using a menu.

I bought an OWC Mercury Pro Blu-Ray disc burner from B&H and have had no trouble burning regular DVD-Rs on it, so I know it works. I also burned a data Blu-Ray DVD and that works fine. The OWC is a top of the line machine that was recommended for home theater Blu-Ray disc burning.

I've watched many Encore CS6 YouTube tutorials and some Lynda.com tutorials as well. As you all know, Adobe does no longer offers CS6 tutorials. I set up the 10 movies and 2 menus in Encore CS6 and they work perfectly within the program prior to "building." I set up the transcoding specs to "MPEG-2, 1920 X 1080 for Blu-Ray". The movies total about 16GB of material (already compressed in the H.264 format). When I try to build the disc I get this message. See screen shot:

Blu-ray Error: "device error", Code:"3", Note: Create StcSequence: Fail to write M2S file.

Apparently, M2S files are the MPEG-2 format. After trying the big project a few times with no success, I put another quickie "test project" together: a 2 minute movie with a single button menu. I even went to Adobe Media Encoder and converted the H.264 file into two separate Ac3 audio/m2v video files and dragged them to the Encore timeline. It successfully burned to regular DVD-R, but I got the same error message when trying to burn the test project to a Blu-Ray disc with Encore CS6.

Basically, I'd like to know how to go about getting ten H.264 movies (that add up to about 80 minutes of footage) on to a Blu-Ray disc to be played on a consumer Blu-Ray player. It's taken me months to edit and create the materials. I'm not one to give up. Personally, I don't care for cheesy pre-made template menus. That's why I made my own.

Any suggestions from anyone you know would be greatly appreciated. I Googled info about Roxio's Toast software and it has mixed reviews. It's $100 for the download. Don't know if it's worth it. Tried to online chat with their 24/7 tech support and they were terrible - oblivious. Other "free download" software I researched is only Windows compatible. The Toast DVD app cost me $35 and froze after downloading it from the Mac App Store. Apparently, it is listed as Mac compatible on the App store, but, guess what? It's not. I complained to both Roxio and Apple. Of course, Apple issued me a refund.

Hope there's someone out there who still burns Blu-Rays.

Thanks.