I read the build and I still have the same opinion.
Feats: you lose 5 feats from casting which means no extend, mental toughness, spell penetration, greater spell penetration or insightful reflexes. If you have 30 spell pen it's fine to miss the spell pen (do you?). Without IR you won't hit the +35 reflex save that really starts to see a significant reduction in incoming damage. Extend/mental toughness are fine to miss once you have gear like torc and bauble to make up the difference but you're missing the opportunity to take shield mastery in this case (which is a much better use for those feats).
Enhancements: 21 action points to ranged. On my
wizard I've had the opportunity to max 3 elemental lines giving me exceptional versatility (which is the strength of the class).
Race: 16 base intelligence might sound like -1 DC but really it's -2 compared to human/drow. I'm at 43 necro, 41 enchant, 41 conjuration on my first life drow wizard, what DCs are you looking at?
Concept: Palemasters shine when they are geared in such a way as to be able to grab aggro and love it. You mention the utility of combining bow and casting but combining casting with guards is much better. Nothing the bow gives can compare to what stacked guards provide a well geared palemaster. Perhaps it's possible to have all 3 but I doubt it.
Gear: you haven't mentioned any gear and that is a massive flaw, you can't fit everything in that you want to make ranged combat and casting viable.
AB: Even with epic gear you'll still struggle to hit in epic content, it just isn't going to happen between your low dex, contended inventory slots and minimal ranged investment.
HP: I doubt it.
What a waste of my time.