Played around with these totals last season. I basically look for lineoffs of 4.5 points and more (may skip the 10-13 pt window).
SEA @ MIN
Posted total: 161.5
Projected total: 164
Lineoff: +2.5
No Play
SAC @ HOU
Posted total: 148
Projected total: 140.5
Lineoff: -7.5
Play: Under
SEA @ MIN
Posted total: 161.5
Projected total: 164
Lineoff: +2.5
No Play
SAC @ HOU
Posted total: 148
Projected total: 140.5
Lineoff: -7.5
Play: Under