I think you did good.
IMO, most TTs are underaxled from the factory. A cost savings to them, as putting the money towards interior "fluff" etc. sells more units than putting those dollars to work where it counts... the chassis.
But most of us, including myself won't spend the $$ to do this upgrade, until a problem presents itself. You had to make a signifignant cash outlay just to fixup your weaker axles.
It was an opportune time to make an upgrade.
I did similar when I upgraded from 5200# to 7000# axles when I spun a bearing a few years ago.