You have a good tank size, but the tangs you mention are somewhat aggressive, I think that simply each individual you have in your tank has a more aggressive character than usual. The YT tang aggression may be because the Black Tang is practically similar to it. Clown tang, Achilles and PW are absolutely beautiful fish, but very very aggressive. Are your surgeons of different sizes? This could play an important role, I'm not sure with surgeons, but in angels, when the fish are the same size they will generally not be tolerated, on the contrary, if different sizes are chosen, it is more successful when combining them.