Tau aren't so good at this level. Our stuff is too expensive. So, you need to cut costs where ever you can while achieving maximum firepower.
First, the warfish is 120 not 110. You may just want to leave it a dumbfish for 85.
Split off one of the Crisis Suits to a single and pair it with the leader. This will allow you to fire at more targets and never take a morale test for casualties. With some of the extra points you may be able to go 3x10 kroot. More scoring units and more targets you can shoot at. I'd rather have burst cannons than smart missiles on my Railheads. They are cheaper and fire more. When you're actually using them. Most of the time you'll want to move at cruising speed and fire the rail gun.
Ultimately, you need to play the list. See what works for you and what doesn't.