2008 Ford Falcon Tyre ware

Hi, my issue is that I have put 19 inch wheels on my falcon and for the second warrent of fitness my front tyres are very worn pretty much right through to canvas on the inside edges of the front wheels the same shape as the bottom spring bracket what would cause this? Do I need to install a camber kit or would be easier to buy smaller wheels? The cheaper option and your opinion would be great thanks