No chicken will hatch your eggs at YOUR WILL.. You have to wait for a chicken to go broody before she decides to sit on eggs. RIR may not be at the top of broody hens. White leghorns are even worse at it then RIR. Some of the best surrogate moms come from the Cochin family. Silkies also do well, but are limited due to their bantam size. Orpington are good also, as other breeds as well. If your incubator wont handle your quantity of eggs, You have 2 choices. Get another or larger incubator. OR Eat all the extra eggs. Your chickens will lay more when you need them.
WISHING YOU BEST