Ok. You definitely have done your research but personally I still think your doing to much. I understand the worries of small tank swings but I think youre essentially holding your cycle halfway through with all the dosing and removers youre using. Not that those arent things youll need eventually but this early in, you shouldnt need to much more then water changes to keep your params in order. In theory you should see random spikes and drops in the individual tests as the different bacteria and algae become established.
My theory is you should really only need dosing as an occasional buffer. The natural growth and regular water changes should maintain a fairly stable set of params. I think youre basically doing the natural cycling manually, so to speak. Meaning instead of letting the natural growth build up and maintain your waters for you, youre constantly chasing params with different treatments. Hence the super clean rocks. Just my theory.
I started with live rock which does make cycling go significantly faster but I dont believe its a requirement. With dry rock, as far as Im aware, patience is even more important. I have read other posts about starting with dry rock and that Dr Tims (Dr Tims a member and did an awesome Q&A) sounds like a great "starter" but it sounds to me like you kinda stripped the bene bacs before they could establish in your tank.
1 other thing I personally think is pretty important is water source. Distilled, though "clean" doesnt neccesarily have a standard. It can vary from batch to batch. If you can, try to get a RODI setup or depending on your location, alot of LFS sell it. My LFS makes 2 types or grades of SW so Im pretty lucky that way and with a small tank, I just have them fill a 6gal water jug.
Ive researched enough about it, I really believe starting with RODI helps maintain stable parameters.
This is all just from my experiences with a smaller tank and is nowhere the guaranteed method.
Glad you clams doing good.
Tanks going to bed but just for some color in my long rambly post...