Where are you in Michigan that you have a soil that alkaline? The guys at Michigan State would probably be interested in knowing that. How was that soil pH determined?
A couple of years ago, in an effort to make a blueberry bed, I mixed a 3.8 cubic foot bale of peat moss in a 4 x 4 bed and a year later had the soil tested and found that the soil that was normally 5.7 pH was now 7.2 pH so I cannot be sure that peat moss in fact does what I have heard for years, lower a soils pH.

In in Livingston county. I've just been told that it's not unusual for the subsurface to be at pH 8.0; perhaps my yard had the topsoil stripped off back when they were building my subdivision.

I've heard that some sources of peat are located where the soil is calcareous enough to raise the pH, and that Canadian peat usually doesn't have that problem.

5.7, huh? Whereabouts are you?

The addition of organic material will help bring the pH towards neutral. So if kimmsr's pH was low it makes sense that peat raised it. The same would be true for a high pH...organic material will lower the pH of alkaline soils.

That being said organic material is not going to make an alkaline soil acidic. But organics may help reduce the amount of aluminum sulfate or sulfur that is commonly added to alkaline soil to reduce pH. Either can be found at a typical garden supply store.

There is a nice chart on the Clemson home gardening site that gives an estimate of how much to sulfate/sulfur to add.

Here is a link that might be useful: adjusting pH

I tried something similar out here trying to grow blue berries - I had a bed surrounded by house and sidewalks so I dug most of the existing sandstone rocks, and then mixed the sandy clay that was left with all kinds of peat, sulfur, acidic fertilizers, 'soil acidifier' (granulated sulfuric acid).

After 5 years, I dug up the blueberries and put them in large pots using a standard potting soil mix. They're doing a lot better. You might consider that for you plant as well. Its a lot easier, too.