HAPPYDEADMAN'S PROFILE

I make a game with a script which randomly increases actors' parameters.
I like the script but it has a problem which is that it doesn't tell me how the parameters are changed.
So all I need is simple messages like MAXHP has increased by 50 points! or ATK has increased by 8 points!
I've tried to fix the script but I still can't solve the problem...
Does anyone know how to fix the script?

http://hikimoki.sakura.ne.jp/rgss3/script_neta/tmrandgrow.rb