My guess would be that the park wants to make the Giant as fun to ride as Mean Streak. :)
Seriously though, I would imagine there have been complaints regarding the roughness of this ride. It's a shame too because the ride was smoother than I have ever experienced at the beginning of this past season. However, last weekend I rode the Giant after it had been raining all day. I am not sure if it was just the wet track or what, but I got a ride so shaky it reminded me of the Rattler at SFFT. And I was even sitting at the rear of the first car, which usually delivers me such a smooth ride.
I will probably get slammed for saying this, but I think this coaster would greatly benefit from replacing the current PTC cars with some that could negotiate the curves a little better. This hop-slamming through the curves stuff is for masochists.
I did not notice this problem at all on SFGAm’s Viper. I was so expecting that coaster to give an experience similar to the Giant. But no, it was total smoothness, even from the back of the train. Now that is an enjoyably intense ride.