The Spit Fire is a great ball, but I have found that it is not at it's best when getting in on a lane. Because of the smoother reaction, the ball has a tendency to leave single pins once you move in. I have drilled three for myself, all with different layouts, and a few for other players, and found that this balls strength is being able to go up the boards, and bumbing the dry, not hooking to the dry like say from fourth arrow.
The T-Road pearl is a good choice for playing in, I agree; You may not see that much difference from the Domination, though.
Don't let the numbers fool you on the T-Roads, they are very strong balls, even though they are mid-priced symmetrical.