I'm hesitant to comment since your methods are a bit controversial, yet somewhat what I've been doing for many years. The biggest difference is that I transplant 10-12 week old plants in a greenhouse soil in early March.

In essense you need to really pay attention to pot size and light intensity after seedlings reach the 8-10 week stage of growth. Depending on variety you will likely only need to wait 50-70 days from fruit formation til ripening.

Those first tomatoes are worth their weight in gold and I would suggest merely thinning the first few blossom clusters to 2-3 fruits if plants are displaying good growth at that stage. Keeping temperatures optimum is important once flowers are forming but you need to arrange for more sun. We have adequate sunlight in March & April at our latitude but 6 hours of it is hardly enough. Cut that tree down now.

I agree with the above. However, I have seen firsthand from seed that things are never accurate or accountable when it comes to growing life seed.

Take care,
Travis