Lorax7 Concolor Fir #1 progression

[Lorax7]

Picked up this concolor fir as nursery stock a couple years ago. Chopped off the top once. Will do another trunk chop at some point to get down lower so I can eventually start building some taper in the trunk line. Been taking it slow because I’m not familiar with the species yet.
Here it is in spring 2022:

 

[Lorax7]

Here it is today:




I’m thinking about doing a trunk chop on this for. It’s my only fir and I don’t know a lot about the specifics of the firs vs. other conifers yet, so would appreciate some input. How far down can I chop and have it recover successfully? When is the ideal time to chop? Fall?

 

[Lorax7]

Went ahead and did the choppy chop today. Wired a branch up to be the new leader.