1. Drill at least one or two holes in the bottom of that container. You may have to water more frequently, but at least you'll begin to remove bacterial neer-do-wells from the equation.
2. Consider adding a low-nitrogen or nitrogen-lesss fertilizer to your watering regimen, one with plenty of micronutrients, once or twice a month. Micronutrients, properly balanced, can reduce the need for N-P-K "demands" that limit plant productivity. I recommend a lil kelp powder in warm water. Dried banana peels, crushed and lightly worked into the soil, also provide a somewhat time-release fertilizer, low in N.
3. Consider limiting "apical dominance" (the phrase conjures images of an ego-tripping gorilla hehehe.) The fact that you are seeing lots of laterals is a sign to me that the plant is attempting to focus its more of its energy into capturing light (vis-a-vis a wider plane of leaf coverage) than trying to capture heat (vis-a-vis upward growth.) This is further indicated by the fact that the plant is wilting at the top. Apical dominance can be limited by pruning the top of the plant, or by just training the uppermost growth to capture as much sunlight as possible. EDIT: By "training," I'm referring to a process of trellising or espalier-ing the stalk sideways, not some kind of freaky deaky tomato boot camp.
Additionally, I'd consider planting some of your laterals in a wide, shallow container, and see if they have a tendency to bush out more or less than your mother tomato. If they do, and that's your goal, then maybe all you need is a different shape of pot to make Mama happy.
Rose Pinder wrote:Looks more like curl than wilt.