Looks like you're not the only one with this problem. A friend of mine, who had his tyre changed to GIII had the same steering and wheel alignment issues. He got it set right. And after that it has been good.
As has been mentioned so many times, the third gear vibration is probably going to disappear after the first service.
A couple of things I want to ask you are around power - Do you feel this car has got good power for its segment? I feel its got less steam during lower rpms. For a palio driver, it must be a more sore problem :-)
The other thing you have not mentioned is the visibility factor. Due to the A pillars, there are two blind spots inspite of the small window. Any comments about that?
VBV
PS: A copy of my 1000 km review posted at TBHP is at:
Rumblings out of a gaseous thoughts: Long term ownership report - SX4