I figured it out. You can burn a Blu-ray within Encore using a prebuilt .iso file. It burn quick and plays fine in my Panasonic blu ray player.
In the Build tab,Under Source select Disc Image
then Browse to the .iso disc image you previously built in Encore
Under Destination select your Blu ray burner model
enter the number of copies you want to burn
Then click “Build” at the top of the build tab.
That worked for me.