Hi, Some of my floorboards are really creaky when I step on them. They were installed in the 60s using secret nails. Solid oak floor will be screwed or nailed with a possible 5.5mm plywood sheet in between lo level it up. If I have the opportunity now, should I put screws on the floorboards where they meet the joists? I did a row of screws to know the time it would take me to do this. Please see the photo attached. Or should I just put screws where on the creaky areas? I would be really disappointed if i had creaky floor after laying the solid oak. I know all the cable runs and pipes in my house so I'm quite confidence I could avoid this areas. Thank you guys!