This is a great question, one I'm still trying to figure out. I'm 200lbs like you.
I owned a great 6'1" x 2 7/8 x 20 3/4 retro fish and it had plenty of glide and I caught waves easily, but the thick rails where a bummer in anything steep. I had fun but it was not high performance, so I sold it and have been trying different iterations ever sence.
My small wave fish is 6'10" x 21 3/4 x 2 1/2 epoxy quad with really small trailers, I use it instead of a longboard. It just glides, it doesn't turn sharply but shure is fun.
I just bought a 6'6" x 20 3/4 x 2 1/2 and have been playing around with it, even took it out in the wrong swell just to try it, it held nice and it was super great glide. Again, not high peformance, but I catch everything.
I just had a 6'1" x 20 3/4" x 2 3/4" made and it had good glide but poor performance, so I sold it almost new, just last month
Right now I'm having a 6'1 x 20 3/4 x 2 5/8" epoxy made , lighter board with the same float, But yeah, sometimes it's just not the right and you have to move on. So, to answer your question, you have to try different boards to get something you like, it's just the nature of surf progression.
Lastly, and as an aside, I have to ask what I always ask. What kind of fins do you have? Specific numbers, if Future fins you'll have to take them off to tell us.