[e1cie1o]

So I just ordered some JH10X3s from JH Audio and am most likely going to build a Mini^3 for use with them and either my iPhone4 or iPod 5G.  Any recommendations on where to start with the gain on the Mini^3?  I believe the default for the Mini^3 is a gain of 5x, but with such low impedance IEMs (18ohm), do you think I should go with 3x or 2x?  I can always switch out the resistors later to change if I'm not happy with the original, but I figure it wouldn't hurt to start lower either.
 
Any input is appreciated!