How you solve this all depends on the size of your plants and the size pot they are in. If they are in small pots which don’t hold much water I would just water with a ph or 6.7 until the run off is back in range. If it’s in a big pot and big plant do the same as above, if it’s in a big pot but small plant I think I would wait till it needs another feed and feed at a ph of 6.9 but not till run off which should bring your ph in the soil back in range. Reason why I wouldn’t flush a small plant in a big pot as the over watering might cause more problems than the low ph.
Apologies for the long reply but just wanted to cover all bases buddy👍