one thing that i remarked is you are setting an CABIN ALT (4000 ft) that is not matching the altitude you want to reach (+9000 ft). this is how i do when setting CABIN ALT. once again, i'am not a pilot irl so i maybe do it wrong but still, i have no problem of press.: - on ground, i 'dump' the press. so that it matches the one of airport. - on ground, i set altitude following two rules: altitude between 0 and 10 000 ft, i set to the exact altitude (in your vid, i shall set to 9000ft if my finale altitude is 9000ft/qnh); altitude more than 10 000 ft, i set to max (=10 000 ft). i avoid to flight over 18 000 ft/qnh standard because of the permitted differencial (?), so i choose my flight level between FL150 and FL180, depending on the clouds and the direction (even or odd). for instance, my finale altitude is 16 000 ft, i set CABIN ALT to 10 000 ft. - after i 'press' (MANUAL CONTROL), once i am climbing, at about 3 000 ft/qnh, i set the RATE while looking at the CABIN RATE OF CHANGE IND. to 300fpm (thx to Intrance). at the finale altitude, i check again CABIN ALT / DIFF PRESS INDICATOR (page 34) and make sure the Inner scale is fine (<5.5psi). - when descending, i set the CABIN ALT to the altitude of the airport (destination) and see (i dont touch nothing this time !) if the CLIMB is changing (CABIN RATE OF CHANGE IND.) - once i am on ground at destination, i 'dump' the press. to match the one of airport. as long as you set the RATE while climbing, you dont need to worry about it. just only set the CABIN ALT depending if you are climbing or descending. now, its better if javier or someone else with more experiences will advice you.