I'm new here - picking back up on SB, but I know youth baseball. I'm sure you'll get lots of opinions.
For drop 8s I personally would stick with older alloys, preferably scandium models. I just sold a 31/23 Easton Zcore - great bat. The TPX Omaha's with scandium all great; there are several 2004 (blue) on the bay right now. The orange TPX scandiums are also solid.
Not a lot of drop 8s around in newer alloys. I know the H2 is available, but no direct experience.
If - big IF, double check - you can use composites, then the CF3/CF4's are good to great bats at drop 8. Younger players generally can't flex them enough to get pop out of the drop 3s, but at 8 you're OK.