Hello, myself and 2 friends are using hamachi to play on one server. I got it to work by following the directions, the server lagged, and my computer has 6gb of ram. So I edited the batch file as it told me to do. All I did was change
java -Xms512M -Xmx1G -jar FTB-Beta-A.jar
to
java -Xms1028M...