So in order to move from Line 4 to Line 3

100% agree. The only way I could get off the 4th line was to cheese a few games (close game, relaunch) because I kept getting benched for the 2nd and 3rd period, even when I managed to string together a few goals. I had the second most goals on the team and even choosing the 20 minute period option, I'd be lucky to get 4 shifts a game. 

It's basically impossible to average a goal per game for that many consecutive games with between 1-4 minutes of ice time per game. I get that you're supposed to earn your ice time, but the success mechanic needs to be relative to the opportunity. My in-game grades barely moved from C -> C+/- ever because I didn't get enough ice time to change the grade in either direction.

Also, maybe it's just my team, but the 4th liners LOVE to play dump and chase (minus the chase). Step over center, shoot the puck around the boards, turn it over, end of shift. So you basically have to use all your energy to rush the zone yourself and then you're constantly exhausted. It kinda kills the fun if you are more concerned about multi-game energy management than you are about scoring.