Have done Chair buttress in a dry powder year and a good water ice year. Chair is very comparable to DK1/Gates on hood as far as difficultly to me. Route finding isn't to bad/ hard Climb enough and you can sniff a way up. The higher consequnce part is the slabs just below and above the Wi3 step on Chair. The snow conditions are way more sensitive. NY Gully is a good challenging route to get on up there. This based on multi summits of Hood,Adams,Rainier, ectect.
Shoot me a PM and we can exchange information, I am always looking for personality's that fit and another option on the climbing contacts list.