I can tell you why teasing ANY line up to go under is a bad bet.
Teasing a side gives you an 'edge' at a reduced payout. Giving you only one way to lose, when the other team scores enough to cover. ( I still never bet teasers )
When you tease up 6-7 points for an under, you have the possibility for BOTH TEAMS to compromise your bet by scoring. Instead of one team screwing you, there is equal opportunity for both squads. It's a bad bet mathematically the second you make it.
Keep in mind, Im talking about general betting principles, not this game in specifics.