You need to do a little more archeological digging still. You need to know the whole construction of the floor before you can decide how best to install something new. I'd take up that plywood piece in the kitchen and see what's under it. It's higher than the surrounding floor, so needs to go. You should also be able to see from there what subfloor is under the original kitchen hardwood. It's too bad the space under your entryway is finished, but I'd still do some exploring from below to see what's under there, and to figure out the fix to stop it from squeaking. Is it drywall below or a drop ceiling? I know it probably seems like a pain to tear out drywall, but if you cut out a clean patch, like 2' x the width of the joists, it'll be relatively simple to repair. Just make sure to cut it down the center of the joists so that there's room to screw the patch piece to it later. Cut the hole under the area that squeaks the most, if you can. Have someone walk on and watch the floor from below to see what's moving. It might be as simple as pounding in a couple shims from below, or face-nailing a loose board from above. You want to find out what's underneath the hardwood. It might be laid directly on the floor joists, or there might be 10" wide boards that the hardwood is nailed to. Another thought is to take out a board in the hallway, since that's not original and you want to replace it. See what the subfloor is there. I am a bit puzzled at why, when you've stripped the kitchen down to the original hardwood, it's still higher than the hallway floor. Is your current surface perhaps not the original kitchen hardwood? Peeling back the plywood area will help determine that. BTW, I haven't heard of that stop squeaking product you linked to, so can't offer any personal opinion. And don't pour self-leveling compound over top of hardwood. It needs to go over plywood.

Thank you HerrProfessorDoktor, I am glad you are letting others know about the issues you are having. It is too bad you regret the dark, perhaps you could restain them lighter in the future? I am very fortunate as I have had dark hard wood floors in my last house and plan to install them again in this house. I love the look and had no regrets last time with care so I think I will be okay. However, I do think it is wise of you to post as there are others who may not know the challenges of dark hardwood floors looking pristine. A rumba is always is a nice little feature to help with much of the dust. ~boxer Here is a great link / poll that talks about this topic. [light or dark hardwood[(https://www.houzz.com/discussions/poll-light-or-dark-hardwood-dsvw-vd~5047868?n=235)

Kim,,,it's very solid. just make sure the glue is spread to completely cover the plank. I have a few spots (like under the kitchen sink) where they missed the corner and it squeaks. They've held up great. I don't have dogs, but I have cats and have heard their nails burning rubber across the floor they go off on their tangents. I've spilled water, cleaned up their barf, spilled food, whatever, it all cleans up very well. as for dents, only if you drop something very heavy. but any wood floor will dent. I vacuum w/a Dyson, and then I use Bona wood floor cleaner on a mop. in the kitchen, i'll often take the scrubby brush and watered down Dawn to clean up spills or oil stains. no problem. no, I don't baby them. I don't wear shoes in my house though. I love my floors. just make sure on install they clean up all the glue residue. my guys were messy and lazy. had to call them back w/special glue remover and rag and go over the entire floor.

hardwod floors are always and will always be the look. though people seem to not underatand thatbthe reason why these products exist outside of harwood. hardwood is just not practical anymore , yesrs ago youd have certain rooms with different flooring to accommodate the room , now, its all usually open concept and having patchy flooring all over doesnt work. honestly i just dont see hoe you can put hardwood lets say in a kitchen , kitchens take a beating , if you can afford to or want to samf your floors every few years , espec especially if you have a busy household , them go for it , i know of no one that has ever resanded their floors and if so , what a mess. so lvp , laminate etc… all have come along due to the demand for the wood look without the issues of hardwood , so its all a decsion though we have decided on 1400sq ft of coretec lvp, we just love the hardwood though just not practical anymore , i cant have adults and kids tip toeing on our floors. plus in the future if you want a new floor , just pick it up , no demo. just my opinion