I lowered my fabia with coilovers and I've had trouble with the arb rubbing the driveshaft, put adjustable drop links on but can still only go so low without it happening again, anyone know how to sort this? 

Sounds too low,  or droplinks are not long enough.  

Better drop links needed or an adjustable rarb.

How low are you? Most people who are lowered fit MK1 Mondeo drop links. But if stupidly low it still might rub.

Does a penny still fit between the sub frame and road kinda low???

It's really not even low, still have plenty arch gap and found when I shortened them it could go lower without rubbing