You won't need nearly so many FWs, but you will want way more crisis suits. I field 7 in 1500 pts lists, between 8-10 in 1750 pts lists, and 10 suits in anything over 1750. I really really think you need that many.
Broadsides are, IMHO, critical. They're the scariest and most reliable anti-armour in the Tau army. Tau simply MUST destroy MCs and enemy mobility at range, right away. Broadsides are how you do it. After you're done with that, the XV88s also come with smart missiles so they remain useful even after there isn't a single MC or enemy vehicle left. Your heavy support should either be 1x Broadside and 2x hammerhead or the other way around.
I don't see any purpose to gun drones in 5th edition 40K. They were great units in 4th edition, but serve no purpose in 5th edition. Your fast attack should be pathfinders and piranhas and nothing else.