I haven't read the whole thread so this may have been said already...
around here there are people that swear by this. When they plant their tomatoes outside, taking them out of the little starter pots and putting them in the final big pot or into the ground, they plant them deep and at a 45degree angle.
Lay em on their side.
What they say is that it will help a skinny/stretchy seedling and cause it to thicken and strengthen the main stem. It also encourages healthy branching which increases your yield.
Ive vet never done it myself but I know a commercial greenhouse that does it and individual people that have does a side by side test and got good results.