I'm not sure where you get your "pluses" from. That first group gives a +4, +2, and -1 for +5 total. The second group gives +2, +2, +1, +1, and +1, for a total of +7.
The most you can squeeze out is +8. 14, 14, 14, 14, 10, 10. You can make the last two in that sequence 12, 8, if you like.