Re: casting heavy flies
First...Welcome to the finest fly fishing, fly tying, fly anything site on the web. Feel free to ask any questions you may have and feel free to offer your knowledge. This site is all about sharing.
You have received some good advise on the first part of your post, but, no one has responded on your question on a braided leader.
I have never used a braided leader, but, have read several posts here on them and most people do not like them. The biggest complaint I have read is that when you cast them, they spray water out onto the surface. I make and use Furled Leaders and I really like them. The braided leaders have a hollow core that fills with water and that causes the spray when you cast it. A Furled Leader is very similiar to a rope when constructed and does not have a hollow core to hold water so it does not spray water when you cast it. I cannot voice any complaints with a Furled Leader. I really like them. You can create one from 6/0 tying thread and treat it just like you do your dry flies and it will float very well for fishing dry flies. I usually fish nymphs, wets, streamers and buggers and I make my Furled Leaders out of Vanish fluorocarbon. Fluorocarbon Furled Leaders really sink and carry your flies down deeper than a standard tapered mono leader. A Furled Leader really turns over your tippet and fly smoothly. I make my Furled Leaders 7 foot long and attach about 5 to 6 feet of tippet material and the leader will turn over everything very easily.
Hopefully, this helps with your questions and once again, welcome to FAOL.
Warren
Fly fishing and fly tying are two things that I do, and when I am doing them, they are the only 2 things I think about. They clear my mind.