Nothing wrong with Ilfosol 3, I have used it a little and it's a good developer. One usually just has to get to a stage where your exposure in camera, developing in tank and printing in tray, produce what you are after.
Personally, your depiction of the (Blue Healer?) itself is good, but the background parts that are quite bright will be a bit difficult to burn in to an appropriate or pleasing level.
The forehead of the dog (or is it a bitch) is where I would have taken a reading from, this would allow me to ensure that I get the darker hair of it's hind, showing enough detail to allow a print.
Many years ago working with drum scanned negatives in the graphic arts industry, I realised that the detail one sees in a depiction on a monitor bears only a passing likeness to what you can actually print reasonably easily.
I agree with David, you should (if possible) work with a contact sheet or proof of your negative(s). In 35mm land it is possible to see some great tonality in a contact sheet, with 645 you will see a lot more far easily, 6x7 and larger contact sheets are something else.
Your observations/questions as to where the different zones fall, seem about right from what I sit, but the correctness of my observation is open to enormous interpretation due to, as David says, variables.
Mick.