Hi Brad, welcome to the fold!
I was in the same position, my Hammer S is my 1st cruiser coming from my Gixxer (which I still own and love).
A few things to note...
Any inputs you make to a sportbike yields IMMEDIATE response, so you're used to making slight adjustments as far as seat position, peg weighting, countersteering inputs, leaning and whatnot. A cruiser needs more input and is slower to respond.
If you nudge the bars on a sportbike, the bike will flick and head into your turn, on a cruiser you need to give it more input and lean harder to get it started.
Typically you'd expect poorer performance from a cruisers brakes coming from a rocket, but our bikes have incredible brakes, and in the case of the more performance oriented Victory bikes with Brembos... they are even grabbier.
You'll rely more on your rear brake now than you do ona rocket. Actually, you rarely ever touch the rear brake on a rocket, and even if you do... standing on it rarely makes much of a difference LOL. On these bikes you need to use the rear to stabilize the bike, tighten the suspension in lower speed manuevering, and assist in stopping. Again, the rear brake on a Victory works tremendously well, so be wary of this so you don't lock it up!
You also lack a slipper clutch now. Be mindful of this on aggressive downshifting.
As was suggested to me (and I am sooo thankful for), I will suggest to you... hit up amazon.com and order the DVD "Ride Like a Pro 5" (you won't need 1-4 as those are added to this newer volume), and it will greatly aid you in understanding the unique dynamics of your new cruiser and make you more confident making tight turns on a bike that weighs almost twice what you're accustomed to.
As far as performance goes, I hate to tell you, but you've actually LOST performance with your new exhaust. I did too because I prefer the look and sound of the 2-into-2 exhaust, but 2-into-1 is the only way to gain performance exhauxt-wise on our bikes.
I haven't added much in the way of performance to my own bike yet, so I will defer to the experts here on what you should be looking at. Diamond has already given you gold in his post above though.
One thing I know that I appreciated hopping onto my Hammer was the transmission smoothness. Leaps and bounds above my Gixxer, and it actually PREFERS clutchless upshifts, even moreso than my Gixxer.
2012 HD Road Glide Custom - Black denim