Your problems sound a lot like mine when I first started. I called the rod manufacturers and talked to them about appropriate grain weight of heads for my rods and even about tips and casting strokes. I came from a background of fishing SH rods since I was about 13 or 14 (I'll be 67 in Feb.) and have just very recently (Sept?) gotten into 2H. Not surprisingly then, I was still trying to do it all with my dominant (top) hand...and that's where my probelm began. Like you I was sure there was something wrong with the rod/line match-up and I was thinking about selling my brand new switch. Then I took some lessons from Ron Lauzon (certified spey casting instructor) up in Sandy OR and even though it took a while for what he tried to teach me to sink in, when it did, it made all the difference in the world. Remembering that with 2H rods...and esp. with the SA cast...the FCS is 80% bottom hand and 20% top hand goes a long way to solving a problem with your forward cast. Watching your anchor and D-loop is another important/absolutely critical aspect. I'm no Jedi yet, but I can at least "feel the force" now. And on occasion I'll cast the prettiest, tightest, loop I could wish for...and 70ft of line flying out there will try to strip another ten feet off my reel. And FWIW, the instructor that I took those lessons with, cast my switch rod...the one I was getting frustrated with...and said it was one of the sweetest rods he had handled, esp at that length, and that the Rio Skagit short and floating polyleader I had on it was perfect. Bottom line is that esp. if you come to 2H from SH, relax, try to let go of all your preconceptions and good/bad habits from SH, and trust...trust the bottom hand to do the work. What have you got to lose?