Why would you like 5.5 as a teaser player? Through the 7 and 10? Not sure it's +EV.. teasing 1.5 to 2.5 up I could understand, but not 5.5.. the 10 is worth slightly less than 7, and it's the 3 that makes the 3/7 +EV
The 5 is worth the least of any number, probably 5-6c, if that.