Lowering 2002 1.8t quattro wagon
 

I've recently decided that I want to lower my car on adjustable suspension. At the moment I've got 20x8.5 wheels. the tyres rub sometimes but only at higher speeds with weight in the back. Theres a carpet like lining above the wheels which it might just be rubbing on, I think its a protector for flying stones etc. I was told you could "roll the guards" and this might help, also because I want to get wider 9.5inch wheels in the near future. Could someone please tell me what the best way to go about this is? Also, an irritating shudder would occur when I reached speeds of over 70-80kmh. I got a mechanic to look at this and they couldn't find anything wrong, but as soon as I got the car back a feint squeeking noise would appear when going slow. as days rolled by it got worse and now when going slow enough and turning the wheel left, it turns into a clunking type noise. Any ideas?