So i dont think the glue had anything to do with this entire situation. I did add more glue after my test this morning where the card was silent without the backplate. After putting more glue on, waiting for it to dry, then putting everything back together including the backplate, the whine was back same as ever. Im almost certain its got to do with the slight pressure adjustment from having a backplate, to just pcb and waterblock. The chokes have a little more pressure on them now and thats stopping some vibration. Im no engineer so i cant prove my theory but process of elimination tells me the glue didnt do much.
Edit: So i noticed there are rubber gromets below the standoffs of the backplate. My guess is with the backplate, the screws stop at the top of the standoffs. Without it, im able to apply just slightly more pressure, pushing down on those gromets. Again, just a theory