Most people gang not because they don't want a one on one fight but because the outcome of a one on one fight is more often then not somebody dieing. People don't play this game to make people run away. By making it more viable to actually kill somebody one on one by improving lag techniques one on one, removing easy to get preps like teleport and fly and word, and putting say a penalty on teleport or something then you will take away the need to gang after all who really wants to split loot and credit.

if you make it harder to seal a kill then people will go to further lengths to do it, until you make the penalty forganging so severe that it does not hold an advantage over solo killing people will use it. if you actually achieve that this game will be no fun because no vets would ever really die unless they choose to.