Based on Andoris's build, I'd say the real advantage of monk 2 splash is GM Wind stance for +10% doublestrike and the extra +4% from Scion of Astral Plane; another +3% if you twist Running w/Wind. The +4 DCs (for Dire Charge & Sweeping Strikes) and Dodge bonuses are the icing on the cake.
If I'm adding right, your Dodge cap would be at least base 25 + 11 Acro + 3 Ninja + 2 shipbuff + 4 SotAP = 45 cap. Not sure how you push it that high, frankly, but combined with Displacement that's a 77.5% miss chance, I think.