Really, dance of flowers works on pure?
There's not much more DPS you can gain that would match fists of iron and 2d6 SA damage. Weapon attachment is worthless.
You still have the earth strikes, +1 19/20 multiplier, evasion, huge amount of dodge, and extra feat to deal with.
Like I said, it felt very close. But, my opinion stands in favor of 18/2. They're both very powerful if built correctly.