Flush grooved primed door panels are similar in that they.
Door jamb not flush with drywall.
In other words the jamb is not at a perfect 90 degree angle to the door and the door hits the jamb not allowing it to completely close.
They can be shimmed on the outside edge using stock cedar shims every 12 to 15.
However you can certainly use it to create a 2 tone look as well where the door panel is different from the wall color.
The drywall is shaved to allow the casing to sit flat on the wall and on the frame.
Flush primed door panels are ideal when you want your wall and door color to be the same.
If not i think your best option is going to be to build the extensions proud of the wall and then bring them down flush with a power planer or belt sander.
The hinges or the edge of the door are making contact with the jamb prior to the door completely being closed.
When it comes to frameless doors flush primed door panels are the top choice for many designers due to their versatility.
The casing door and window frame moldings should be mounted parallel to the drywall not canted in.
Nail through the shims and then trim the shims flush to the outside edge of the casing.
This is caused by over shimming the door jamb opposite the hinge side.
2 basic time taken.