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I can't answer this for certain, but based on your description of the problem with a pressure surge:
I have seen this when the vent is either clogged or otherwise restricted or broken. The inertial pressure has to go somewhere. If the door isn't venting correctly, the first spray will be intense. On some Whirlpool built units, they vent by putting a flapper on the water inlet. Other dishwashers utilize the door vent. If I were you, I'd start looking there. Fill your DW and place your hand by the vent to see if you feel air purge out when it first starts to spray. If you feel nothing, the vent is most likely part of the issue. Without allowing the air somewhere to go when the unit starts spraying, the flipping glasses make a lot of sense to me.