Your Dex will just be too much while your HP is low. Clowns and Gypsies have LOW HP that can easily be killed if not used properly. I already have all those king sets etc. and i saved some stat points from dex and agi (i already have 195aspd) and put it into VIT and INT instead of building the stat points to dex only.
and about INT being optional, it is optional but i recommend people to put some stat points to int since JT cant work if the opponent is a an int user, Mostly champ, and if he is in pneuma your probably dead cant even hit him, the only chance to kill him is to use JT then AV.
and thats what Improve Concentration and the king set for.. to give extra dex so the 20 Stat dex that should be removed wouldn't be a waste. i deeply suggest to just make it 280 rather than 300