Replying to Should I Detune My Skis?

This is probably a common question, but I see a lot of different answers. I've heard people say it depends on what construction type it is, I've heard people say yes but only underfoot, I've heard people say yes but just at the contact points, and I've even heard people say that it's not necessary.

So, Should I detune my 2013-2014 Armada El Reys? It's a cap construction positive camber ski and I have the 171 cm version. I plan to hit about 60% jumps and 40% rails. I'm about 150lbs.

Also, how much should I detune them if i do?