Cummins x15 low boost after delete

[DDT LLC]

Was unsuccessful getting the program sent over but got the butterfly valve removed double checked the cans and everything is gutted and everything was good also changed the exhaust back pressure valve and tube was really dirty sensors on insite all seem to b reading right no check engine light and new turbo was installed before deleting maybe 2000 miles ago did over head twice and also gear train adjustment did injector cut out all passed only thing left is a leak down test does anybody have something I might b over looking I'm getting very frustrated with this dang thing thanks for any ideas