'69 Barracuda door glass, front up stop?

The passengers side door glass won't go all the way up in the vent window channel. The glass goes all the way up in the rear. I have the FSM and its fuzzy at best on up stop adjustment. Note '69 has an up stop mounted on rear of glass where as '68 has slot with nut in door for up stop.

Glass contacts roof weather strip at the rear. But at the front glass won't go all the way up. I took that rubber thing off the top of vent window channel didn't make any difference. Seems to be something in door solidly keeping front of glass from going up.

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Im thinking its a vent window frame adjustment thats needed