Actually, too much "fertility" can be detrimental to tomato flavor.
I would get a catalog or visit the web site of Territorial Seed Company and get their variety which is an improvement over Sweet 100. Sweet 100 is very prolific, sweet, and tasty, cultivar of cherry tomatoes, which are the easiest to grow successfully. Territorial's improved variety (I can't remember the name but the description says it is an improved Sweet 100) isn't susceptible to the frequent and easy splitting that Sweet 100 is susceptible to. While splitting does not occur if the tomatoes are not over-watered, mild over-watering does not otherwise harm tomatoes; it increases internal pressure, giving cherry tomatoes more of that "explode in your mouth" thing that most people love about them, but does not decrease sweetness much, if at all. However it increases splitting. Also excessive rain, at the right time, could cause splitting, so a non-splitting variety is a really good idea. As far as I know Territorial is an exclusive distributor of the non-splitting Sweet 100's.
These did very well in my Long Island NY soil with tons of compost in it. There is a possibility that they may not be so happy, and do so well, in
your soil.
Here is is,
sweet million. That's the one that did well for me. I've tried about 10 different varieties and only sweet 100 and sweet million did exceptionally well for me, in my soil and climate. All the bigger tomatoes turned out blah. Territorial's web page no longer provides the descriptive info I provided above, about Sweet Million being a non-cracking Sweet 100. But I remember that is what they used to say, and indeed, in my trials, they tasted better than Sweet 100, and Sweet 100 cracked very frequently, and Sweet Million hardly cracked at all.
The page says "available only as a plant" but I know I bought seeds when I bought them several years ago. I don't think i'd want to be bothered with the problems of shipping plants all over the place. Germinating tomato seeds in orange juice cartons is not difficult. I don't recall if they need a warmer or not (some seeds like melon seeds won't germinate in 70 degree indoor temperatures, I can't remember if tomato seed had this problem to deal with, or not - look it up.)