I am growing in the soil but that has a good mix of general potting compost and some wood ash which I add every year. I always start the toms early, january-ish, in the house and put in final positions when about a foot tall. Pinch out regularly, same spacing. Plants appear to be the same along with the fruit being identical in size, colour and ripening time. They have been ripening for the past month and I initially thought I had 1 iffy plant but they (and the plants given to family) are equally rough tasting. Quite annoying when GD toms are my favourite and the main reason i run 2 greenhouses. As a slight add on it is also my worst year for produce elsewhere in the garden apart from my onions, but the tom situation has miffed me somewhat. Another thing I have noticed is that the plants this year have growths similar to what we pinch out from the main stalk, but these growths are on a lot of the leaf / branches. Never had that before. I will try and get my wife to upload a picture tomorrow. I have butchered the tops of the plants due to the poor crop and will probably allow them to continue to fruit but give the chickens a good treat.