The rear tip in adjusters for the windows ARE located right behind the red
reflectors on the door panels. You DO NOT have to remove the door panel to get
to it. The reflector is held in by two tabs at the top and a spring steel clip
at the bottom. Pry up from the bottom carefully to remove it and gain access to
the rear tip-in adjustment screw. Back off the lock nut (10 mm) and turn
adjusting threaded rod (4 mm hex head) ccw to increase tip-in, cw to decrease.
No need to hold the 18mm window regulator pulley inside the door.

The rubber grommet under the door at the rear gives access to the aforementioned
18mm, and a height adjuster (with the window rolled down).

Front tip-in and height adjustment is under the rubber grommet at the front.
Similar to the rear, but entire assembly slides transversely with the body of
the car. You'll see the slot and see what I am trying to say in words.

Go easy on the adjustments and plan on making more the one attempt to correct
the problem. The seals need to re-adjust to your changes and may create another
leak in other places. No problem if you go at it with some caution.