Don, I suspect you're more than right ..
that the 'problem' was the off-set nature of the hook. Most tube fly's are rigged with a short shank, ring eye hook. For larger fish either a #4 or # 2 3X. I'm not sure, but I suspect that either Aaron or Redshack could get these in say a size 6 or 8 for more of a 'small fish-small fly' rig.
Drop them a PM.