Can't help you with Logic, but Pro Tools should remember the last playback engine you used, and default to that every time you launch. If it's not doing that, maybe it's time for:
Quote:
Pro Tools Preferences
This procedure will reset Pro Tools preferences to a default state. Try this to correct odd or erratic behavior in the application:
From the Finder, click on the 'Go' menu at the top of your screen.
Press and hold the Option key on your keyboard and choose 'Library'.
Go to the Preferences folder.
Go to the Avid folder.
Go to the Pro Tools folder.
Delete all files in this folder:
AvidListFile.txt
DSIPrefs
InstalledAAXPlugins
Last Used.pio
Pro Tools Prefs
updater.properties
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If that doesn't work, 10.10.5 might help. Pro Tools can see the HDMI option on my screens, but never asks to use them unless prefs were trashed.