Did you know that there’s 1 button you need to press only to set the DL rules? Just 1. Next to the private button in the host tab, you will see 5 preset shortcut buttons. Press the DL button if you want DL. If you want SPD, then simply change the banlist to Speed Duel, card pool to ALL, and then go to the extra rules and uncheck the Half Burn Damage.
That’s it. The reason you’re having problems is mainly due to the Extra Rules.