Basically it goes like this.
Get the following schematics:
- Swan Longbow 22 damage metal, 6 offensive leather, 6 offensive leather, 6 utility leather
- Thick Longbow Grip 12 offensive leather, 6 offensive leather
on any offensive leather slot fill with Great Bear Hide which gives 1.75% crit/slot
on any utility leather slot fill with Snoufleur Skin (easier to get) which gives 1.75 Dex/slot
Get headpieces with crit on them. They are easiest to obtain in the winter palace quest.
Maximize your utility leather slots on remaining gear.
- Superior Prowler Armor 21 leather armor, 5 utility leather, 4 utility leather, 5 utility metal
- Prowler Armor Arms 8 utility leather, 4 defensive leather
- Hunter Coat Legs 6 utility leather, 3 defensive leather (tier 2 schematic, but highest utility leather).
Get a superb crit chance ring
Get a superb crit damage ring
Get the superb stamina amulet from killing the Sandy Howler.
A superior skirmisher hat is also good but I suck at getting hat schematics.
I also get sneak attack from the dagger tree and run with Varric in my group. My crit chance is around 56% but I am not fully geared. My crit chance when flanking is 100%. That normally means 100% of my leaping shot attacks crit.