I'm getting same problem as largekilla... its loading the mod with -9.8 grav...
gamerule
matchframes 2000
turnframes 10
flags 0
dismemberment 1
fracture 0
disqualification 0
dqtimeout 0
dqflag 1
dismemberthreshold 5000
fracturethreshold 0
dojotype 0
dojosides 0
engagedistance 100
engageheight 0
engagerotation 0
engagespace 0
engageplayerpos -1.52,1.00,0.03,1.52,1.00,0.03
engageplayerrot 0,0,0,0,0,0
damage 0
gravity 0.00 -25.00 -25.00
sumo 1