Keep in mind that on a fairly flat and high traction track even an 1:10 OR car will be faster if lighter. We're then more or less racing "onroad" with some jumps. For 2WD on astro I actually tried before LiPo was allowed to use 4 cells and a 3,5 turn - the improvement was remarkable!
It's a totally different matter on a bumpy, rutted track, with low traction...
I'm a very experienced 1:8 TR driver, and there's never any doubt that lighter is faster! BUT - when it's raining and very slippery, then a heavier car actually has an advantage. Simply more grip!
We're never overpowered in dry conditions, and the corner speed is so high that less mass always is faster. But in the wet you're overpowered and need to "sneak around" the track.
There used to be a swedish 1:8 TR car back in the 70/80s called "Viking". It never really did well in dry races, but very often won in the wet. And that simply because it was very heavy! (I don't think they really knew why back then)
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