The folks over at Gink and Gasoline are doing a fine, fine job, Olympic Medalists and all. They have a post with some casting tips to help you on the flats and it is good advice.
Good technique and timing can input far more power into the casting system than sheer muscle and effort. Casting as hard as I could worked against me ten fold. I wasn’t allowing the rod to do the work and I lost control of my casting stroke in the process. Both of which, ended up opening up my loops and keeping me from consistently laying out a straight leader on the water during my presentation.
Saltwater flats casting is just different from most anything else you are going to do. It has its own set of skills and you are not magically imbued with them just because you’ve caught a bazillion trout.
The big difference is the wind. The wind can be your friend, putting a little chop on the water makes the fish feel more comfortable and masks your approach and cast. When you are looking into the face of a 15 mph wind, or a 25 mph wind, things can go badly, and quickly.
Read the tips from Gink and Gasoline and then go practice a bit. Doesn’t make sense to spend a couple grand on getting to some dream location without working on your ability to deliver at game time.