THis is what i came up with after smashing my brain into understanding the flow of viper for about an hour on hit dummies. My thought process is identical left and right placements for single target and aoe combos to coincide with vipersight. Both Single Target and Aoe Combos have a Serpent's Tail placed for easy access for less page hopping. 

Dreadwinder is placed the next to the single target combos to enable ease of use tocatch the trail end of Noxious Gnash leading into Hunter's Coil/Swiftskin's Coil and Hunter's Den/Swiftskin's Den placed in similar paired fashion matching the placement of Twinfang and Twinblood to more intuitively feel the order to hit them in as you move. Pit of Dread is placed on the right arrow of RT/R2 in this case due to it only needing to be hit in aoe scenarios thus needing less priority but still placed in a way for easy transition into it's matching combos pairs. Uncoiled Fury and Whirling Snap are both placed on the expanded back pages to be used for downtime and slither is placed on a face button for easy access in movement phases.

xilibrius