Suggestion:
- Remove the possiblity to go through the keep door, if the gate is receiving damage. Give the door a timer after a hit, that does not allow to go through
- Remove the rule for <50% health to go through the the door.
- Give the Defender the possibity to use the door, on a successfull defense
- Give attackers a chance to get a door down, by limiting people who go back and for through a besieged gate
see you on battlefield