Sonata I45 (LF 2015+) :: Low Power / Quick Shifts In All But Sport Mode

I now have 1025 miles on my SE with the 2.4L. I will admit that I drove the car very easy during the first 800 miles. The car has always wanted to shift into higher gears way too quick even in normal mode. I was told that the computer may have been "trained" to be being a conservative driver. I am not a speed racer, but I do not drive like I have nowhere to go either. I have tried driving a little more aggressively (holding down the throttle and making it shift around 2500-3000 rpm when I can), but it still has not worked. When I make a certain turn and up a hill, the car chugs up the hill until it finally decides to downshift into a lower gear and it will finally go. If in sport mode, it does fine. I cannot leave in sport mode however because I do a lot of freeway driving and it will not shift into overdrive in sport mode, at least my car don't which I find odd??

Another problem area is when I first start out, I go up a grade on a highway. I have to literally press the pedal down about 3/4 way to even get it to speed (55 mph) within a reasonable amount of time... it was only around 2300-2500 rpm and I was almost flooring it. I pressed down the pedal more and it finally kicked into a lower gear and hit up to 3300 rpm and finally took off. Something is not right and I am not happy with my brand new car that I paid almost $19,000 for. I enjoy driving my 1991 Cadillac more than I do this new car and it is a heck of a lot faster than my Hyundai. I do love the MPG I get with the Hyundai... around 31 mpg on average versus 19 mpg on the Caddy.

I just don't know what is going on with my car. I am wondering if I need to get the computer reset or something?