Thanks man,
Think 10# Ultragreen will stand up to 30# Powerpro?

You could run 4lb leader and 30 lb braid and get away with it....with the right rod and drag setting. Your thinking into it waaay too much.

The "cushion" the rod will generate is as much dictated by the action of the rod as it is by the length. You could have a flimsy 8 foot rod that provides a lot of cushion or a 15 foot rod that is stiff and provides none. Most people fish longer float rods in order to help mend the floating braid and/or keep the braid off the water entirely.

A 10' or 11' float rod is about right for most people although everyone has their preference. I use a Loomis 1263 and consider it a great float rod.
Seeing as how you want cushion, you're likely to start looking at "noodle rods" (long and super-soft). I'd avoid these rods as they lack the backbone to land fish quickly when/if you need to do so.
Good luck. If you are already breaking off big fish, you're basically doing it all right. Just bump the leader strength up a couple of notches.

I understand that 8# leader will break much more easily than 30# braid, as well as the fact that some fish will be lost regardless, i just meant would 10# Ultragreen generally hold up a leader material with 30# braid.

The Clearwater generally runs light green to gin clear most of the season, and I would prefer to use 10 rather than 12# leader; after 15 years fishing it, I have gotten bit more using 10# that 12#.

I was basically wondering if I could get away with 10# leader most of the time.