https://mods.factorio.com/mod/AtomicRobotsFix2Boost/discussion
When playing k2, the size is only 1, I hope you can increase the compatibility to make the size 7.
The author in the link above fixed this problem, I checked the code and it seems to add the following content, but after I added it, it was an error

if mods["Krastorio2"] then
data.raw["logistic-robot"]["atomic-logistic-robot"].speed = 0.0694
data.raw["logistic-robot"]["atomic-logistic-robot"].max_health = 50
data.raw["logistic-robot"]["atomic-logistic-robot"].max_payload_size = 7

data.raw["construction-robot"]["atomic-construction-robot"].speed = 0.09257
data.raw["construction-robot"]["atomic-construction-robot"].max_health = 50
data.raw["construction-robot"]["atomic-construction-robot"].max_payload_size = 2

end

Yeah, it's broken. Unless the uthor adds compatibility I won't play with this in my new K2 run.

The fix above is from antoher mod. It won't work here.