I can see you're going to do the core aeration, so here is some more advice. Since you have it you may as well use the heck out of it. The bermuda will survive no matter what, so drive that thing up and back, across and back, diagonal and back, and then the other diagonal and back. You need all the holes you can get. When you're finished, whether you use compost or not, then spray again with shampoo at a higher dose (6-10 ounces per 1,000 square feet. Then water it until you think you're going to fill in all the holes (you won't). But if you do fill the holes and it seems like it won't drain, then you have a bigger problem. I don't think your soil is compacted. Sure the heavy landscaping equipment drove over it but they are designed for landscaping. If you tried to compact the soil with that equipment it would be hard. You would have to start with soil that was completely saturated and drive over it until you sunk in and pushed all the air out of the soil. I'm sure that didn't happen. Most contractors will leave the job site at the first sign of sprinkles. If that still doesn't work, then Lou has alluded to another approach I have used successfully using a soaker hose. It is not what you might think, but it worked every time I tried it. I gave up on that approach once I learned about shampoo, but I certainly remember it.

In the case of shampoos, if you color your hair, you should spend the extra money on shampoos that protect your color. Unfortunately I have found most inexpensive shampoos and conditioners contain alcohol, and even some of the more pricey (like Pantene)have alcohol. Look at the ingredients. If it has alcohol, it will strip your color and ultimately dry out your hair. Many inexpensive conditioners make your hair feel conditioned because they contain wax which does nothing but coat the hair. The combination of wax and alcohol will ultimately require you to use more product and wonder why your hair is so dry without it. There was a special on one of the news shows (I think 60 minutes) that exposed the fact that many of the products we buy today like conditioner and lotion actually contain ingredients, like alcohol, that do the opposite of what you think they should. What good is a moisturizer or conditioner that drys you out?

I have hair that's fair-colored, naturally curly, & fine to medium textured, so it's easy to damage, & naturally dry in our hot & dry to hot & humid climate (central Arkansas). I was told I needed something with a lot of natural moisturizing ingredients, and I started buying TCB ethnic and Aussie Moist shampoos & conditioners again after using many different expensive salon brands for a year or more. But, I love Dove's new 2-in-1 shampoo/conditioner! It's great for when I stay with relatives & in-laws, or on the go (i.e. at gyms & public pools) all of which where showers & bathroom time are limited.

Low-pH coupled with hardness tends to occur more in the north-eastern US, where precipitation pH is low. However, there are also areas of New Mexico and Arizona with deep wells with natural mineral acids and hardness. When TDS is high, all sorts of interesting things can happen. My question regarding the company's lack of supporting evidence was directed to your nature as a chemical engineer. There appears to be a disconnect between what a typical chemical engineer would recommend at their job and how they would justify those recommendations, and the style of your recommendation here and I was curious about that. Perhaps you obtained some information from Nuvo not readily available on their website? I also didn't recommend controlling via pH, but via water flow rate, which is done frequently in residential acid neutralizers and is not overly difficult or expensive. Please note that I have not said the use of citric acid to alleviate hard water problems lacks merit, just that this specific company's solution lacks control measures and this particular company appears to lack understanding of the tech. Water treatment does not easily lend itself to a one-size-fits-all solution.