that would be the front side of the mountain; that specific area is known as pioneer ridge and extends across the front to Christmas Trees, no names and N st pats. Morningside is the backside of the mountain.
Its another nagging problem at the boat in that to get higher up on the ridge to access those areas, you have to either traverse across from the Storm Peak lift and walk or take the morningside lift up to the top and then hike over. A new lift from Storm peak to the top would be pretty awesome but it gets enough traffic already. There are some really nice tree shots with some steep short shots along the ridge that can be accessed by carrying a ton of speed off of buddy's and then traversing out along the ridge. That area along the area of the Chutes are really great on a fresh day or after that provide a nice 1K or so of a mix of short steeps and tight evergreens that run out into low angle pow meadows. Fun stuff. I find the xmas trees to be more work than worth it though.
personally, i prefer skiing 1500'-1800' of non-stop aspens from literally lift to lift on a pow day; its probably 20-30* which is plenty steep for good tree skiing where you can ski more fall line. The area you didn't get into is some of the best kept tree skiing on the mountain and is pretty much left untouched for 2 days and is easily accessed. Most never go in as its very tight along the entrances with evergreens and accessed off of the sunshine lifts so most locals dont go there.
There are now more areas of beetle kill mitigation that offer some excellent new terrain but we aren't discussing that