The one that fits me best is in the "Trinidad," the Hot Spot tub - this is the low-end line that is a crossover from Caldera. It fits me like a glove! I had to try it wet to be sure, and it is wonderful. I have a Vista, which is an awesome spa, but the recliner just doesn't fit like that Trinidad did. Er, Trinidad does.
Anyway, keep trying. There are plenty of different shapes and sizes amongst loungers.
And if you float but want to stick with it, try no suit, or less suit. Then try a "no float" belt or something similar.
Worth a shot if you happen to like the lounge.