Regarding moving around, I do use the charges in my books, I'm use to it with that char and I make them myself so that's no biggie.
I can drop my SS a bit and the others to suit, I like what you have posted there Ultima, with perhaps some slight mods with the stuff I have, such as the bloodwood spirit totem with 10 ss and 5 necro.
As for the spells I use as a necro archer and the mana pool, I hunt with a shadow wisp (2+ if permissible) and stick to bows with added mana and stamina leech. Curse weapon seems nearly equivalent to consecrate weapon, which is why I question the chiv use, and I also sit on evil omen and strangle often. For mobs I'll toss a few poison strikes into the crowd while I have a short bow with the lighting special. Passing out a pain spike to those who are quick movers. Additionally, I use mana droughts and pots when in need.
I can live with whatever casting I can get, I don't necessarily depend on it.
Also, with bushido, how high is really necessary? I see I can use the special strike back, but that's only effective with parry. That's a skill that needs a higher skill amount, but is there any benefit to other bushido skills with an archer besides lightning and confidence?