I wouldn't read too much into Giles' home/road splits at this point in the season. He's coming off an awful slump, but it looks like he's back on track. Look at his splits for 2004 and you'll see he actually hit BETTER at home in Petco. That doesn't make much sense, given the size of that park, but it shows how well he can hit there.
I am the Master. Don't question the Master. Just do what he says and be proud.