First check previous post from Alex about roof sliders that will help.
Check to see if the crome handle is worn on its mounting pivit! as you could be losing valuable lifting movement from the height rod adjusters if you crome handle is lose,
Check the nylon ramp sliders are not worn down as this is a home made fix only, these ramps where there to help push the roof up before adjustment is needed.
Before adjusting your roof height at the rear slcken off the roof height adjustment collars at the front first!
Check that the small brass lifters and not worn, and check around for rusted or broken sliders...better still pm me your phone number and i will talk to you, typo is one thing having you sit in your car looking at your roof with me talking to you is much better.