I rebooted everything and also had to upgrade the os on the Blu’s and I’m working! The critical reboot seems to have been the windows machine I installed roon on. I think the FW changes didn’t take effect after the roon core installed.
As for speed - so far a HUGE difference over the synology! And this is just an old i5 thinkcentre with an SSD. But the music files are still on the NAS. (about 60K files)