Ha! Funny I see a longboarding post on my first day on the forum. I agree with most of the sentiment here. Bigger, softer wheels will give you a much smoother ride for cruising. If you're not sliding they'll last a very long time.
As for wheel bite, you'll either need bigger risers or a shape (like a drop through) that allows for the wheels to miss the board. If you're so inclined, you can also cut out wheel wells on the bottoms to make extra room. If you've gotten wheel bite, you'll see a little rubbed out mark on the bottom of the board where the wheels stopped (the moment you realized you were about to eat shit, as they say). Take a wooden dowel, 4"-5" diameter (a little bigger than your wheels) and glue sandpaper to it. Rig up an attachment to mount it to a hand drill or drill press, and physically sand out a little pocket onto each spot under the board where the wheels would bite. Often this little 1/8" to 1/4" deep pocket is *just* enough to prevent wheel bite. I'm sure you can google the process as well. It's very easy, and feels good to buy that extra 1/4" of no-eating-shit-today insurance policy.
Next, I see you're in Wisconsin too. You said you wanted to do some downhill. Head towards Baraboo/Dells and hit me up for some great, great hills. There's a lot of locals taking up the hobby. And have fun!