if they were my plants I would pick the worst looking one, water with some 6.5 water and see what the run-off is, if it comes out 7.5 or higher I would water them with 5.0 water, they should perk up in the next few hours.
If temps are good, the pots as you say are dry now, its starting to look not like over watering, overwatered plants will recover as they dry unless the roots were wet so long they are rotting. They look like healthy plants that have a high ph, same looking as my pics I posted.
what are you using to test ph... and check the run off of the worst one. and report back.