Not sure where you’re pulling weights from, but I’d caution comparing weights as your Checkpoint weight is higher than my actual.
Again, my SLR 9 weighs 18.5lbs (8.39kg) with 2 bottle cages, pedals, 4oz sealant, mounts for wahoo, Varia and front light at a size 58. (caveat, I swapped to a lighter/more comfortable saddle).