Just keep the weightlimits as is. Changing the weightlimits doesn't make the game more popular, doesn't add to the excitement or makes it easier in the end.

Of course, the weightchange for the heavies from 80 to 100 kg gave a boost to the amount of eligible participants. But did it improve the total playing field? Nope, we did see more less competitive machines appear on TV, but works of art still were a rarity.

Same for the feathers. Changing from 12 to 13.6 kg, in exchange for the consumable rule in all classes didn't add a lot. Rather the opposite. Still there are people succeeding in building 16 kg rambots...