So for those who own the Hogyoku variety and are getting pumpkin orange fall color, please share details of where you have it planted, 100% full sun required?

I have many tall douglas fir trees on my spot but have planted the Hogyokus in areas where there is a lot of sun but am unsure if the lack of pumpkin orange is due to sun or perhaps our falls here in Puyallup, Washington perhaps aren't cold enough to snap the great color or ???

I just bought another Hogyoku and am trying to figure out where on my lot to try this one so any tips from Hogyoku owners greatly appreciated!