Cummins ISX cm2250 vibrations after demandate

[Kingcali111]

Hello fellow forum members hope you all are doing good. I recently de-mandated my 2012 cummins isx cm2250 600HP and after de-mandate my truck doesnt seems to pull good as I use to pull with 600 Horses. The truck vibrates badly and doesn’t pickup any road speed from about 1300 to 1400ish rpms. Before de-mandate I never thought that I am hauling 80k gross with the power I used to have. So by reading and understanding from the previous postings in this forum I know that my final crank angle is not good. I heavily researched in Calterm about final crank angle but I didn’t find that parameter anywhere in cm2250. Could someone please help me out I don’t want my strong engine to ruin in front of my eyes. I rebuild the engine about 120k miles ago. Please advise me that which parameter should I check out and change to how much to feel back the power again.