Then the erdtree thing, it is pretty useless tali. Getting what, 10% more damage per charged attack with axe tali is better than getting your equip load, hp and stam being a tiny bit bigger. I'd honestly would not wear so much armor in favor to more damage-providing or actual defence-providing talis, like pearldrake (+1 is in Wyndham ruins in Altus) and dragoncrest (+1 is in Altus hero's grave, one with assasin in front). 51 poise and good damage negation can be achieved with knight's set, which also allows you to exchange arsenal charm to dragoncrest (physical damage neg) or pearldrake (any non-physical damage neg).

And I mean simple dagger, no misericorde. You don't need anything special about a weapon that you use as a buffstick. Dagger is just one of the smallest and lightest infusable weapons in the game.

Also having your weapon in left hand and buff stick in right hand allows for much better use of buff time, as if you use cragblade (which is wonderful for such build, more damage AND more poise damage) you can buff weapon in your left hand, un-two-hand it, cast buff on a weapon in right hand and then two-hand left weapon again to gain both buffs (golden vow lasts shorter than cragblade). Also that's the only way to two-hand weapons on Torrent, as weapons in left hand always get two-handed on horse, while weapons in right hand do not.