You have discovered a new gene that encodes an unusual regulatory subunit of pka, which you name ro. As with the r2c2 version of pka, ro forms a dimer and interacts with two molecules of the same catalytic subunit (c) found in pka to form a ro2c2 heterotetramer. However, unlike the r in conventional pka, each ro subunit binds 8 molecules of camp. Which of the following properties would you predict ro2c2 pka would display compared to the conventional r2c2 form of pka ?.