Yes you will notice a huge difference. You will probably find the new setup much lighter. Also I personally like 10ft rods that extra foot is a big advantage for getting the most out if your drifts.
As far as leader setup, there are so many sources of info out there. Ive tried it all, but have come back to just cutting the tippet off my regular dry fly leaders and attching about 18” of sighter material (I use 8 lb amnesia and then 4-5 feet of 4x. This leaves enough fly line out of my rod tip to be useful when casting. I fished mono rigs for a few years, never really saw the benefit. I am starting to think it is all marketing at this point but to each their own.