I can't say that they've made adjustments or not, but I can share my experience with Flight of Passage.
First, the numbers: I'm roughly 5'6" and was approximately 290lbs (down from 334 earlier this year) at the time I rode FoP. Most of my weight is in my mid-section.
Before boarding FoP, I tried the test seat. The CM helping there suggested that there was no way that the seat would reach the locking position due to the leg restraints. Now...I don't have skinny legs, but they are *far* from my largest feature. In fact, I'd reckon that my legs (especially the calf section) are rather average in size. And yet, the reason that the test seat didn't work for me was not for my mid-section, but for my legs.
Nevertheless, I was stubborn about it and decided to try the ride anyway. Upon arriving at the *actual* ride seats, I shoved every bit of myself as forward as I could. When the back and leg constraints came up, they locked in place just fine. In fact, once they were in the locked position, I felt as if I even had some wiggle room and could relax a bit. I was in no way uncomfortable.
The ride is AMAZING. I'm very glad I ignored the results of the test seat and tried to ride anyway. It was well worth it and I'd have regretted not riding it.
As has been said elsewhere in this thread, different bodies have different shapes. Just because I had no trouble, doesn't mean that others won't. I'm just suggesting that you should ignore the test seat and take a chance with the actual ride seat, especially if you have a FP+ (in which case, the worst that can happen is you waste a little time and endure a little embarrassment from people you won't likely ever see again).