kinda stretching to try and make this work, eh? as you note, bismuth dies easy, which when it happens (frequent) is gonna result in arue being prone for a round, and yeah, until you get the improved snapshot feats you do indeed need to be in melee to take advantage o' the the reflexive aoo. seeing as how long point blank master is delayed in the neoseeker build, if @Gorth thought arue was dying too frequent in his current normal run am having difficulty imagining what his reaction would be trying to make her snap shot effective. w/o trip on your beastie you are also sacrificing potential aoo chances, so bismuth is more o' a half-arsed desperation option to make complete not viable slight less so.
and arue ab being similar but not quite as good until 19, at which point the vanilla ranger due to gear and improved quarry significant outstrips the neoseeker build is maybe not the best salesmanship o' a build, eh?
to be snapshot effective is requiring a multiple feat investments to make a niche build viable, feats (improved initiative, improved precise shot, etc.,) which may arguably be spent better elsewhere.
also, am thinking there remains a misunderstanding as well. to get the most outta arue's ranger's bond you need a significant number o' instant enemy casts. otherwise, you got a swell favoured enemy bonus worth sharing at 50% strength against demons of magic and pretty much nothing else. a mere +1 party bonus 'gainst demons o' slaughter, demons o' strength, humans and outsiders? so yeah, the loss o' five levels o' spell casting is deserving more than a hand wave. when kp and others moan about stat bloat, arue with an instant enemy bolstered ranger bond is yet another option for stacking ab, an ab boost which is in fact better than a pure bard's.
btw, the first level the neoseeker arue build sees a single instant enemy cast is sixteen.
oh well, not gonna agree on this.
blur actual ain't terrible for potions as it has a three minute duration. be wary o' other potions as they may have exceeding short durations or limited efficacy. mage armour is another decent potion as the bonus is a flat +4 and the duration is hour/level. if you don't use barding, then a potion o' mage armour is a no brainer unless you have superior bracers of armour on your critter.
shield of faith potions offer the absolute minimum protection possible for the spell, which is +2. have sosiel cast and the benefits will last longer and be more effective, rendering up to a +5 o' deflection.
barkskin potions get a ten minute duration... am thinking is ten minutes. but again, you are seeing only a +2 boost to natural armour when you could benefiting from +5 if camellia or another caster o' at least level 12 applies the buff to your horse.
am agreeing with @majesticthat your animal companions deserve to be buffed and geared with similar forethought as your primate party members. you don't need to spend a diamond to rez a horse, but as enemies is more likely to attack seelah's horse than seelah, there is a good reason to make the horse resilient.
that said, if you are having fun doing as you are doing, then is good enough. no need to consider advice if you are progressing just fine already. however, at the end o' act iii there is a couple encounters which offer difficulty spikes similar (worse) to blackwater, and the downside is you are not gonna be able to respec w/o using a mod or by reloading a save which is temporal remote. won't be able to buy additional scrolls or potions either. you will be stuck with current resources and builds trying to get past hurdles more frustrating than other act iii content.
HA! Good Fun!