Crobat doesn't have a horrible special attack, base 70 is decent. But you're right, a physical Crobat is far more useful than a special Crobat.
OT: Your team looks really solid, can't really suggest anything mon-wise as your pokes counter each other weaknesses.
However, if you have the time for it, you can breed for better moves/ivs/natures/etc.
All your pokes excluding Crobat (for the Acrobactics boost) should have items, possibly Plates/Lefties/etc.