I trained with a huge pack. I only carried that much on the mountain on one afternoon, when one of the fellas was feeling poorly. But being fit is a good thing in any event. On the mountain, I think you're better off doing multiple carries and not wearing yourself out.
As someone said, enjoy the mountain. It might take a few extra days, but what the heck, eh?
We had lousy luck with cell phones and radios. If I go back, I'm going to spring for a sat phone. The folks back home want to hear from you- let them enjoy vicariously. Or at least a SPOT, although from recent experience that raises as many questions as it answers: "They're not moving! Did they fall in a crevasse?"
We took more clothing than we needed. And skis were not the ideal solution. But it all depends on the conditions you encounter- we had rock-hard snow, almost no precip (always dry), and it never got that cold (-25° min). YMMV
And as someone else pointed out- lots of things are different if you are with guides vs. on your own.
No helmet. Two poles. And here's a real snow saw: