I dont understand if you booted at 4500 at one point there should be no reason your stuck at 4133. If the imc can do that.
Alot of useless babble from some others contributing nothing to the conversation.
Like I been saying your problem is you need to sort out the timings start loose and work your way down. Plenty of reference material.
Your TRFC at one point I think 450 Is one example that is probably much too tight over 4000.