Do you spread your attention between too many people?
My motto from a few years of going to conferences and networking cocktails is that it's always better with 1-3 new, lasting, relationships than 50 new business cards...
Did you go into fights that could have no positive gain.
Indeed, a fight that was not forced upon one of the participants only has 2 losers.
Keep up the writing!
I guess on conferences you want to give everyone the chance to remember your face next time. However, you don't want to go away with nobody being able to remember your name ;)