Don't worry about the soil being damp. Mix 2 tbsps of lime to some water, then water your plant heavily, til the cloudy water starts running out the bottom. Then, if you watered thoroughly, your PH should come up to where you want it, and hold there. Let things dry out, as usual, and continue like you normally would. Just keep an eye on the PH, 'cause it might take more than one application of lime, hard to say. At any rate, it'll be much better than before.