I also have a Prince Exo3 93, which is a lovely racket but just a touch too heavy for me, whereas the Bio 300 is perfect.
I didnt go for the Tour version, I just stuck to the standard 300 and it suits me just fine. I've made no modifications at all....I havent needed to. Although I look forward to the gecko tac grip losing a little tackiness soon....its pretty clingy lol.
Plus, I think with almost all of the Bio range, they are nice looking rackets as well.
"Tennis is just chess with balls."
Sometimes: Prince Classic Graphite 100 - Sometimes: Prince Exo3 Graphite 93