Very pretty and it will likely improve over time. I have 'Summit' FCC and 'Merrill' AM, which is a slightly bigger form.
I also grow them under LEDs. I'm curious what LEDs are you using?
Stunning. I have one of those from Windy Hill as well. Seems like a healthy little plant but slow growing, as you said. If mine is half as nice as this one I'll be happy.