I have a follow up to everyone's advice, as well as a question or two. I dug up the sod around the base of all four trees. My fingers are so tender I can barely type! I easily found the flair on two of the trees, one maybe and the largest of the trees not at all. On the latter trees, I dug down to where roots were starting and called it good. I replaced the area with mulch. The trees really were planted at the right depth, but the sod had grown up around the flair so I can see why this was not healthy for the trees.
I loosened the ties on the smaller trees. The large one didn't need loosening. On several of the areas the ties were starting to embed in the bark after only 7 months, which to me was a testament on how quickly they are growing. They are not ready to lose their supports just yet, one nearly fell over when I loosened up the ties. (scary!) I also cut part of one of the supports off since it was rubbing on a new branch and causing a deformity.
I made an appointment with the owner of my landscape company to consult on the trees. There is no odor from the wells, so I wasn't overly concerned with the anaerobic soil suggested previously. We decided to not add further aeration to the roots. We did however turn off the deep root watering system since they're linked to the beds which get watered several times a week. I'll now use the tube to run a hose down every 7-10 days for deep watering.
Here's the bad news from my landscaper. I can't turn down the grass watering. In fact I'm already killing my grass, and need to turn it UP immediately. We're now into the hottest part of the summer and it needs to be irrigated daily. I'm hoping that since we've blocked the lateral roots and are only watering deeply, that the grass watering won't overwater the trees since potentially their roots won't feel the effect. It was explained to me that the water from the grass only needs to penetrate the soil enough to water the lawn, and so we'll do two short waterings set 2 hours apart so that it can soak in without runoff, and then resoak the top layers only. I failed to mention that we also had an extensive drain system installed along with the irrigation, so it should carry excess water away to the gutters. I'm feeling like I'm between a rock and hard place with the watering. I don't want to sacrifice the lawn nor the trees.
I took some photos of what I believe is the flair, the indention from the ties and the mulched hole in case anyone cares to check them out. If so, let me know. Sorry for the storybook here, I do feel passionate about my trees and hope I'm doing the best possible for them under the circumstances.
I invite your thoughts and/or constructive criticism. Thank you, C.