Agreement from me on all points. The shoulder bells are a bit far out, so I will be redoing the strap to take the extra inch off. I'm a little worried I might be pulling the shoulder strap out a bit much by that also, so when I revisit the shoulder/chest strap I will see what I can do to ensure the shorter shoulder strap doesn't pull it out of whack.
I think my biggest complaint about TM was that it's not made for 6'6" (198cm) people! Wow, what was Paul thinking, making his suit for normal sized people and not me personally? ... Yes, the chest ab straps are under a lot of stress, and the only way I could think to fix that was exactly as you said, add about an inch to the back/shoulder strap to let the chest come down a little. This will most likely be split between the back and front since they both have an equal amount of pull. I will have to experiment with it. Already I've got only 4 ribs on the shoulder ABS strap to the front, and 4 ribs on the back ABS strap, so I don't want to go to far or it will ride to low, so I will play with the positioning some to get it to sit right.