If you increase the game's resolution on kongregate by a few pixels on the width and the height(maybe 10) it might get rid of the scroll bars. It worked for my friend when he asked help from kong :).
Guys It's not just the perfect tower that's broken. I think Kongregate broke something :( Games like Dawn of the Dragons, Brave Tales Drakensang, Game of Thrones Ascent,Rise of Mythos and Age of mythos aren't working for hundreds of players.