Welcome to the forum. I myself very seldom play teasers or for that fact pars. However with that said, I have found that the more teams involved in these type of wagers usually the lessen you chances for success. You picks apear solid. Good luck.
Not that it counts for much, but IMO, teasers usually fail because one of the teams ( or two in a three teamer) usually lose so badly that the points don't do anything. That said, its a solid set of picks, but be extra careful to look for the potential loser in this, since that is what usually happens. I guess the reason that one team gets blown away is that the percentages of at least one team being totally off the line increases as you increase the number of plays. Anyhow, what do I know