I’ve tested many builds on Whiskey even after i reached the master 2 month ago. And running Attack Speed and Crit dmg, is really powerfull on him i usually use his legendary and Vow of Zealous Fury. Which means around +30% attack speed and it’s wonderfull, you can fire as fast as if it was automatic
I’ve tested Recoil Reduction and i don’t like it, i can control the recoil without any problem on PC so recoil reduction is useless on him (for me).
As third Item Heliophagic Googles ( is pretty nice on him as you can crit easily)
So my build is :
Galaharic Gun Grease
+21% +15% = 36% Reload Speed
-14% Recoil
+15% Attack Speed
Vow of Zealous Fury
+8.40% +8.40% = 16.80% Attack Speed
+7.14% Crit Damage
Heliophagic Goggles
+11.90% Crit Damage
+5.04% Attack Speed
Blind on Crit every 5sec
= 36% Reload Speed, 36.84% Attack Speed and 19% Crit damage
Slow on grenade at level 1 and Swiss Cheese at level 2 for 15% more damage (25% soon) and the 4burst at level 7
And btw Attack damage with a Symbiotic Gauntlet is also really good as it stacks greatly with his +25% damage passive…
For PVE Chrono Key = Spam Grenade and Ultimate (before the nerf it was perma ult xD)
not the PC. 

