wong teaser hedge question

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i have the jets at leg left in a wong teaser at 1 to 3 odds on a 4 teamer.

obviously if i take miami at +7 i will hedge that unit plus the chance for a middle.

to figure out my chance on a middle to win, do i add up the push rates on the numbers between miami +2 and miami +6? should i include buy up to 7.5 and add that the +7 push rate to see if that is more profitable?

would it be a good idea to take miami +7 and parlay it with the over or under?

if the total has a 50 percent chance of hitting (i don't know the correlating numbers on pro football so it may not be 50/50 if i am taking miami), does this change the break even rate on a parlay with miami +7 considering my teaser?

thanks.

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on the parlay would i say i have one 50 percent bet (total)and one bet where i would take 50 percent and add all the push rates between between +7 and +2 to give me the odds on my second bet? then calculate the odds for the corresponding percentages.