Help: should I hedge the 4th leg of my teaser?

[CTKid]

Motivated by Daliman's idea I bet all possible 2, 3 and 4 team teasers with these games:

GB +8
Minn +8
Chicago -2.5
Jags +7.5

I flat bet 1 unit on all of them (6 2-team +100, 4 3-team +180, 1 4-team +300).

If Jags don't cover, I finish down -2.2 units. If they do cover I finish up 16.2 units.

I got in on Jags +1.5. Its now +3.

Should I be hedging this with a bet on the Steelers? How do I figure out the optimal play?

Thanks in advance.