I think I should have used wafer head jack-point screws to connect the MF5 bars to the MF7 bars as in the video link here.    https://youtu.be/hhX4n7RT8Uo?feature=shared   I used Gypframe MF9 Connecting Clips and when you walk on the floor above, or open and close the door, the ceiling squeaks a lot!    Anyone else had an issue with this and know of a solution. I can't easily use screws now the ceiling below is up. Can I screw them in from above? Or use some rubber