I don't quite understand why would they increase the minimum character size on character creation/customization. In JP I can go as low as 142 or 143 but on NA I could now go below 153. It will be annoying change from a playstyle point of view (specially for veterans), hit/hurtboxes and the reach of some PAs are tied to character's height and this can make a world of difference to some, specially for those who have affinity for TA rankings.
I'm not even sure if the NA devs are even aware of the hitboxes or how they work in the game. They are mainly just porting, translating, and running the servers. The TA times or SRs of other content will fall greatly behind JP server. So if you are coming over to be competitive in either of those I recommend staying on JP unless they do change the height back.
Here's hoping they will notice all these changes that we actually want to see in the game and how it though actually give it to us he's hoping the in a daze will truly make PSO to into america in a term of sets