The downside of a 2s or 3s setup is that it will indeed have less torque and more heat compared to a 4 to 6S setup. I would stick with a real 1/8 motor for a long term and go for a SCT on tight or indoor tracks only. The EB48 is already very light and having a car that is just too light could make it harder to drive especially on a rough track. I see it myself with my JQ when I go from a 2200mah lipo to a 3700 in 5S between the quals and finals, the weight can be an help to have a car that feels more planted. It will be a bit slower in the corners of course but it's just a compromise to find. I try to have the lightest car I can, but there is a limit where I do too many mistakes to make it worth it. That said an experienced driver will handle a very light car much easier, so its up to the driver