Hey Jimmy- for sure it wont be spongy like the older bikes- the seat seems harder over the stock 09 touring bikes, and lower profile tires 18" wheels give more road input- But dont worry the ride quality can be improved a lot. You will come to really love this bike especially on the highway.
Try adjusting the air pressure in the tires front to 36 and the rear tire to 38psi- if you are carrying 300+ lbs keep max pressure. Then try adjusting the air suspension: make sure to use the pump mentioned above or similar progressive suspension pump- otherwise go back to the dealer and have them check it and adjust. Don't use anything else- like a bicycle pump or compressed air- you will blow out your shocks. You mentioned you are 165lbs- start at 20 psi-ride it then try 25psi-or 30 psi I set mine at 35 psi, and I weigh 215- and it was a little hard.
I took off the airshocks and installed the Progressive 440 series shocks- and I am happy to say the ride quality improved significantly. These are a little pricey, but IMO worth the investment. You might find a second hand set from someone on the forum; or look around on ebay. Alternatively the Progressive 412 series is more of a budget series shock compared to the 440- and I havent tried them on the 09 SERG, but they worked very well on my 06 RK, and are half the price. If you decide to go with the progressive shock- you would want the standard sping- not heavy duty, and they are 12" length.
I first thought the bike road a little rough compared to my old FLHX, but after new shocks, I really enjoy riding this bike more and more every day- it is ( so far) the best riding and handling Harley I have ever owned. So there is hope! Good luck-