You should definitely have both ZRAs maxed on the gunner tree. It's one of your main multipliers that you should be trying to get as often as possible. And as a class that specializes in burst damage, you should also have Chain Trigger and Chain Finish maxed as well as Twice Chain to build your chains quicker.
S-Roll Up and S-Roll Arts are useless skills, don't max them. The usefulness of S-Roll JA Bonus is debatable. I personally don't use it, nor do I use Aerial Advance.
On the ranger tree you definitely need Standing Snipe 1/2 maxed (useful for all ranged weapons), and I would highly recommend First Hit. With First Hit you'll find it very easy to one shot SH mobs with non-JA'd Satellite Aim, Diffuse Shell, and pretty much every launcher PA, and even when you don't one shot it's still useful, since it's not always advantageous to use a normal attack before firing off a PA. Sometimes you can even whiff your normal attack on purpose just to get a first hit JA.
Tactics Trap is great for pp recovery with both Gravity Bomb and Stun Grenade. Optional, but pretty good skill in my opinion. Priority would be to take points out of Dive Roll Advance, Shooting Up, or Killing Bonus to finish off SS and First Hit. The rest of the tree is fine.
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