My thoughts:
In principle lighter is always faster. But only if you have enough traction. If we talk about onroad cars, a heavier car will normally actually be faster in the wet (or with very low grip). Under dry conditions with good grip a lighter car is not only faster but also better to drive.
For 4WD OR I think that without question a lighter car is faster. Unless traction is very, very poor.
For 2WD OR it's more complex, as the amount of traction is much more limited. The laptimes will easily tell the truth... I agree somewhat with Richard though, since the Losis need lead in the front and B4s in the rear, there must be a very slight construction mistake. Still, we are talking about small amounts of lead here... The only thing I feel could be even better would be to get the same "added grip" from downforce in stead of weight.
(I tried with 5 cells on a very slippery track to get power down. Still, the car felt better with the "dead cell" in the car. The weight settles the car better)
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