An update on my swim and compare Swim Smooth to Total Immersion please..

Hi, I haven't posted on here in awhile. I started learning to freestyle last June. Took a few lessons from a bad instructor, fired him, took up the TI method. TI is going "ok", but after months of practicing, it's just not happening well for me. It has made me a better swimmer, it has made me much more comfortable in the water. The concept is good, but without having another buddy willing to do it with me and an instructor to look at you, it is very frustrating. I am considering the swim smooth videos. Anyone have experience from here with them? How does Swim Smooth compare to Total Immersion in concept?? Would I just be wasting more $$?? I have a very good friend/swim buddy that is a most awesome distance and speed swimmer. He has been helping me. I still struggle with my butt sinking. He said today it did look odd, my head was "nearly" flat enough and my kick was good, but....my butt did sink down below the water level. I am tall, 6'3.5 inches 225 pounds. I maybe a lil slumped shoulder?? I dunno if that is why I continue to struggle with this sinking butt issue or not. I am trying very hard to swim like I see myself in my mind. I guess I'm that "Legend in my own mind". ;) Here's me: swim one lap pretty easy, breathing on one side only. (My left side isn't flat as it should be yet, so when I breathe there, every third, it throws my balance off, I kick to correct that and that makes me winded). Currently I'm breathing every right side stroke. But, sometimes, I can breath every 4th on my right only. Left side being my weak side if I try to breathe on the third. My kick is pretty flat and when I'm doing good, balanced well, I can feel the natural kick from my hips. If I'm getting tired or off balance I feel my quads kicking. I'm keeping elbows up, getting better at "anchoring" some water and rolling over it. I just want to endurance swim about an hour. I love the water, am willing to do the work and I just keep going back. Swim a lap, rest a lil, swim more. But, I gotta get my head to stay flat, 1/2 goggle in/out. So, anyway ,just really wanted to see if the Swim Smooth Videos have helped any of you and how it compares to TI. Thanks! Mark