I'd say that it's no problem. I'm from Wisconsin also and our water is quite hard.
You're on the right track by not wanting to tinker with your water parameters. Rams are sensitive, but as it turns out, most sensitive to changes in pH. If you are trying to make your water do something that it doesn't want to, the changes in pH are very stressful - not to mention the extra work for you!
I've had rams spawn at a pH of 8.3!
If you can get them through the first month, they will probably do fine. IME, they are the most sensitive when you first bring them home and they might have some diseases/parasites.
I can't imagine keeping one with a frontosa! Too stressfull, I like to let the rams be the rulers of the tank, and keep them with smaller tetras etc. Stress from other fish really brings them down fast IME. They are one of my favorites!
windsurfer