Subframe connectors or window adjustments?

In searching for subframe connectors (google) I see a wide variety..
I have a '96 coupe with no go fast options.
Will subframe connectors make a difference in body flex?
Is the something you have done at body shop (as I'd assume you'd want
to make sure everything is level/flat to begin with.)
The only reason I suspect that I may have some flex is.. the driver's
window hangs on trim unless I close the door by pushing on the glass.
Door matches up properly (no hinge wear or adjustment appears needed)
Glass doesn't appear to be out of adjustment.. just catches on the
little bent metal thing made to hold it into place. Pushing on window
to close the door causes the glass to flex inward just a hair..
If I close the door "normally", the glass will hang on the outside of
this metal tab and outside of window seal.