Fitted vogtland springs and damper - OUCH

40mm drop, fitted it all including new top mounts and bearings.

It feels fine, everything is tight but even 10mph over a speed bump sounds as if it's bottoming out or somethin? Makes a horrible knock or bang.

Corners and roundabouts are amazing, one of my mates has a clio 182 and was saying how the hell is my car sticking, haha.

A lad who's been in more modified cars thinks it's normal for a lowered car but maybe it is a bit loud, it is the first day mind you.

Thoughts? Things to check?

Only difference I can see is there's a little yellow rubber on the standard shock and nothing on the vogtland one, if that's it then it means my suspension is bottoming out with no effort at all which is ridiculous?