too much magic?

There is no such thing as too much magic for an arcane veno, tho you might want to add a couple of more points in Str to keep current with arcane armor requirements. Other than that, don't worry, if you feel you need to add more vit for better survivability then by all means go ahead. As long as you add at least 6 Mag/1 Str every 2 levels you can use the remainder points for either Mag or Vit, as you see fit.

At level 26 you should have 18 Str, just remember when adding Vit not to take those points away from Str. That aside, i see nothing wrong with your build.

For what you're trying to do, there's nothing wrong with your stats so far. In fact, I'm almost tempted to argue that you don't have *enough* magic. =p If it was me trying to make an arcane caster veno, I'd have just enough strength for robes (as you've done), and dump everything else into magic, and nothing into vit.

But I know some venos who like a little vit to increase survivability. It's largely personal preference. But don't worry about having too much magic. The only time you should worry about having too much magic is if you start feeling sorry for mobs and bosses.