This game is definitely doable with two lone wolf mages. However you seem to be struggling with your builds. There is absolutely no reason to have level 5 anything when your character is level 8 (except dual wield). The earliest you can get any master spell is level 12 I believe. So you wasted quite a large number of points that could have been used to diversify your mages. You are much better off branching one point into each magic school than you are taking one straight to level 5. It sounds like you made it hard on yourself but if you can make it to level 12 you will be fine. In that time, please diversify your spell schools. It allows you to have more options and thus deal with more situations, keeping you alive. Some things will still be quite difficult since you have no physical damage dealer but stick it out man.
