2012 ranger 621 help

[waleye7]

I have a 2012 621 with a 250 pro xs the problem Im having is it wont go over 5400 rpms Im running a 21 rev 4 partner has same boat but 23 tempest motors are in 3rd hole when trimed up steering is extremly hard and feels like boat wont trim high enough both boats are running the same but different props any ideas