If I correctly added up the times you listed in the OP, you waited a total of 25 minutes or so for the PB to work. Try liberally spraying on the PB and let it soak in overnight. If that doesn't work, then move on to the more drastic measures that others have listed.
Oh, and you could always try driving the car to a local mechanic or muffler shop and have them crack the bolts for you with their air tools...
Good luck!
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