Grats! Glad to hear it worked. I thought this would be server-sided for sure, but then again, shards and crystals aren't either.
On another note, I remember seeing a reddit post of a +10 Alfonse screenshot apparently on the poster's friends list. Only had like 2 comments I think? Tried to find the link again and failed, but I did find this: http://blog.esuteru.com/archives/20009295.html
Edit: Just checked, the +10 units have max stat+4 on each stat like it should be.