Where are you located?
There are several, very skilled casters in the group -- I'm not one of them, but I've worked with them (and on my own of course, relentlessly) and viewed probably every casting tutorial that exists (Borger, Wulff, Kreh, that Orvis guy who sounds Australian and wears the blue shirt, etc.).
What do your loops look like? That always seems the most central component to me -- everything should build (hauling, shooting line, etc.) on good, narrow loops and should not "stand in" in place of them. It's easier for me to carry a lot of line in the cast if I have really good loops on the backcast, moving "upward" and behind me with good line speed.
Someone watching you would probably help. And yes, trout fishing can be more about managing a drift with very short amounts of line out than actually launching a cast out there. I consider saltwater fly fisherman among the most technically sound casters in the world because (to me) there isn't anything more demanding than quickly making a 40-60' cast to a moving target, with nearly guaranteed wind and a long leader and typically heavy fly. Most of the trout fishing I've done in NO WAY prepares the angler for this.
Hence:
Gene