I have all of the Sylvania Osram and Cree bulbs on the lightify gateway using
and haven't really had any issues. At times there seems to be a little lag if the gateway hasn't been used in awhile.
I appreciate the responses and they reinforced my decision to keep these devices on a separate network.
I will most likely just purchase a 2nd HE hub and move these devices to that hub. Unfortunately, not all of my lighting devices will work on Hue or I would just go that route. I really don't want to use the ST hub as I lose the local control and thus my living room lamps and master bedroom closet light in the event of an internet or most likely ST outage.