Replying to Summer setup skiing

First off my summer is screwed in terms of summer skiing; I have to wear a sling for 3 weeks thanks to dislocating my shoulder, plus I'm moving. But anyway, what length of skis are best to practice with on the summer setup? I have Chronic 171s and some old beat up Afterbang 155s. Longer would be the exact same as what I ski with on snow, but shorter would be easier to handle and would fit through the transition easier. What length do you guys ski with on your setup?