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These are all great ideas the sprays should be at 30 PSI as Kookoodookoo noted. 80 psi is way too high. I am also interested in the spacing of the heads (how far apart are they?) What kind of nozzles are on all of the heads, 18',15',12',10,8',6',5',4. Are the nozzles clogged? Where is the 80 PSI measured? 7 minutes in Houston is not that much in June, July, August.
It sounds like it is time to get wet.
Some more Ideas.
Good Luck