I currently am working on PE2 and PE2-im and have pretty much mastered both movements. Upon looking back, though, I realize that the mobility for the first progression might not be up to snuff. I have no issue with deck squats, aside from sometimes not coming up to a complete stand (due to fatigue form the work-week/ or a lack of focus), but have thoroughly mastered those. I just wanted to double-check that as I do twisting squats as a warm-up that they are in fact at mastery. If not, I'll also include them in my work sets as I may have progressed too quickly. Let me know.
Thanks