my egts are running 750 to 850 just crusing not towing if i push the throttle hard ican get 1200 before i chicken out and back off i checked the innercooler for leaks , found nothing ,:any ideas on cooling things off

 

that seems about normal.

 

I agree with clutch, seems normal.
Cummins says you can run at 1250 degrees all day without worries. You could turn your boost elbow up a bit to around 30-32psi, to see if that helps.