Strange Wobble/vibration

Hi I am looking for some pointers I have a 06 vrs tfsi lowered about 30mm on pi springs and dampers also has powerflex front wishbone bushes and a powerflex dogbone insert all fitted since late June I had 4 wheel alignment and balancing done on Thursday drove 35 miles on m40 all fine came home on back roads at speed between about 25 to 30 mph there is a wobble/vibration coming though foot wells not uniform and not every time more on smooth roads but that could be cause the car is quite stiff and I feel a lot of the road I can only feel it on the drivers side slightly though clutch rest my wife seems to be feeling it more on passenger side and said it is someone tapping lightly with a toffe hammer under foot well also at the end of my road there is a right hand bend with very rough potholed tarmac when i come round this with all windows open there is a metalic tinc sound just onec each time round bendit is going back to tyre shop today so hopefully they can see and sort but ime not holding my breath any help much appreciated and sorry for the long post