Please don't change Viper

[Shiruyui]

Red = rear, green = flank. Unless you have red/green color blindness, there's 0 reason to pay attention to anything except the final attack's color

Just looked up the job rotation guide and I was right.

If you get the damage buff i.e Hunter's Instinct, the positional will always be flank and vice versa.

The positional's for dreadwinder pretty much helps with this deduction because you get the potency buff for swift if you hit the rear.