Front end knocking

[Brucie cabanos]

I have a 09 estate, I am getting a knock from the front over gentle bumps round town. It’s most noticeable over rumble strips like the ones at end of dual carriageways an stuff. Can’t for the life of me find what’s causing it. I have changed the top strut mounts (twice) new quality sway bar links, checked all subframe bolts ( all tight), bottom ball joints and track rods tight. It’s really annoying me and makes the car sound like an arld taxi. It sounds like its coming from both sides and and can’t really pin point it. It’s 80k, no no crash damage. Any ideas appreciated