If you are skiing steep lines on those touring days and really taxing the muscular endurance in your legs on those down hills then you do not need to do supplemental ME work midweek. Your plan looks good.
I’d suggest one day a week of some Max leg strength as maintenance. This Max session can be roughly 1/2 the volume of the big weeks you finished with in terms of sets and reps. This would mean half squats to keep the strength up. It would be easy to add this to a one day a week general strength workout that included upper body and core.
I’d replace one of the strength workouts with another recovery or Z1 level aerobic workout as aerobic base maintenance.