Woodland Sniper (Slayer Archetype change)

Woodland snipers are guardians of forest and grove, keeping vigil on their borders and hunting bounties and trespassers from the shelter of sturdy branches.
I Have the High Ground! (Ex)
A Woodland Sniper gains a +1 circumstance bonus on all ranged attack rolls made from elevated terrain. (Elevated terrain being constituted as a position that is at least 10ft higher in elevation than their target's, excluding attacks made while flying or falling.) This bonus increases by +1 per 6 levels of Slayer the Treetop Sniper possesses, to a maximum bonus of +3 at 18th Lv.
This ability replaces track.
Ranged Sneak Attack (Ex)
Beginning at 3rd level; whenever a Woodland Sniper makes a ranged sneak attack, the size of their sneak attack dice increase to 1d8's. On all melee attacks; they become 1d4's.
This alters sneak attack.
Still Shot (Ex)
At 7th level, the woodland sniper reduces the penalty on Stealth checks to remain hidden while sniping by half his slayer level.
This replaces stalker.
Canopy Climber (Ex)
At 11th level, the woodland sniper gains a climb speed equal to his/her base movement speed; and they also gain the Druid's Woodland stride ability.
This allows the Treetop Sniper to walk upon and through the canopy of trees without penalty; nor or fear of falling / snapping a limb without outside influence.
This replaces swift tracker and slayer’s advance.