I mean your poisons will not be as strong as wugu3 poisons, since attributes increase +1% poison Base skill damage per point.
Also, poisons stack together, and do not stack with themselves. If you use needle blow, another wugu using needle blow after will delete your needle blow (caution during worldboss/etc) - so you won’t deal damage.
A3 Wugu2 offers a lot of extra single target damage through Twin Arrows + Poisons (Needle, wugong gu). Another reason why I dislike wugu->SR is Gu Pot. You canNOT use gu pot (nice AoE skill) when you are mounted, so be prepared to use Needle blow + Wugong Gu + Zhendu. Zhendu has no %enhance attribute.
Wugu poisons cannot crit, and benefit most from STR. Poisons gain 1 extra damage per 1 physical attack, and each STR grants you +1 physical attack.
A2/A3 swift step benefits from crit rate, through DEX stat or through equips. Your preference and equips should determine your stat build, str:dex. There are reiters who statted max 25 CON, and could survive because the mounted pet HP bonus.
If you like strong poisons and more damage, definitely (High) STR + crit/dex equips. In this post in another thread I listed all crit and dex equips for archers in-game: This progression viable? A2>sap2>Wugu2>can 1
The post of that thread was about archer/wugushi.
A reason for high DEX would be extra crit rate and evasion, however evasion has a hard cap of 80%.