It doesn't look like fusarium wilt to me. I don't see any of the tell tale yellowing coming up from the lower part of the plants. Fusarium doesn't really do much leaf curling except when another disease or mineral deficiency is present at the same time.
Since the soil is so acidic maybe your plants are taking up too much of something or too little. You may need to really bring up the soil ph fast to get a little closer to neutral. That can be done with quick lime but if you use it be very careful as it is very caustic but it will raise your ph almost immediately. I have noticed in places where manure was plentiful and packed down for years that plants seem slow to come back to the area. I guess you can have too much of a good thing.
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