Hey,
yeah if you want a serious game it can be hard to find by random, not everyone feels the same all the time 
It is probably better in tournament games, where people feel like something is on the line.
Or (and sorry for the shameless plug, but everyone knows I am a sellout :D) you can check out openstudyroom.org we have a league system where you play on OGS or KGS to player’s liking, league games that have sole purpose of being longer and taken seriously.