Quick question, what do the Brick Division and Explosion Damage Scaling do?
Brick division is the way the bricks want to divide. If it's set to "brick", they'll fragment into bricks before plates (causes more vertical lines than horizontal) whereas if it's set to "plate", they'll fragment into plates immediately (causes more horizontal lines than vertical).
Explosion damage scaling is totally useless unless you have giants/midgets in your minigame. The default game uses what I call linear damage - in other words, damage * Z scale. The other mode is cubic - damage * X * Y * Z scale. It's more realistic, but I don't recommend using it on a public server. The RL at 2x scale with cubic scaling creates a 24 TU blast crater. (That's 96 brick studs in diameter, roughly.)