How about opening up a new tier for level 250 players that would reset their level i.e. elite mode for goals. Have the elite players only face elite in PVP but offer better drop prizes and new RP. You could make some ridiculous XP requirement and/or sell the elite mode for gold. I think it would be wise to leave syndicate battle alone (a current 250 player who goes back to level 1 elite would get the points for normal level 1 player vs ...). It could open up a whole new reward for players to level up before battle so 200+ level players could earn the points due them through their dedication to CC.