I have a pretty solid plan for this army. A large part of that plan is to have most of my 'jacks controlled by 'jack marshals and a journeyman warcaster (or two). This will allow my main 'caster (Stryker/Caine/Sturgis) to use his focus for important 'caster things. The other part of the plan is gun mages, more on them to follow.
After a couple of test runs, I am liking the advantage of some extra focus and an additional arcane shield. So far, the best results are pairing her with the charger and hanging behind the main battlegroup, but I think my opponents will get wise to that soon.