Personally I wouldn't want to have a pair of Stockli / Kastles / Renouns as a teaching ski that is going to get the usually ski-school trashing. If you were only teaching advanced privates the answer might be difference.
For teaching lower level skiers I'd want something with mid-80s waist, not super precise / demanding to ski, slight twin so you can ski backwards at times, and beefy enough to rock around the hill otherwise. Probably a hair of tip rocker for those times you get off piste between lessons?
Somethings disposable that can still ski....remember you skied the E100, if you like that maybe the E88 HD? Brahma? Monster 88? RTM84?
At 220#, you shouldn't have problems bending any of them even at slowish ski-school speeds.