Need help on Windshield Setup and Suggestions!!

The hole in the cowl should be a bit oversized and there is a fat seal of high density foam that fills the void. i your case making that hole larger is one option.
It might also be possible to alter the pivots mounting flange in a dont raise the bridge lower the river sort of effort. Would that increase or decrease the wipers presure aginst the glass is a factor to consider.