Oh Slick i am so sorry to be reading your update, i can only hope what time you have left with Max will be as best as it can be,you have to take comfort in knowing he has had a wonderful life with you, and you have given the best chance possible, just keep in mind his comfort,we want to hang on to them so desperately.
I am not so certain about the peeing a lot with kidney cats, my kitty is a kidney cat and he does not pee hardly at all,he can go all night long before i need to let him out in the morning and he does not use a litter box, however i told my vet and he said that was a good sign really,so perhaps with Ash he has not reached that stage yet, here's hoping.

I really feel for you at this time, it is sad and stressful and distressing for you, you have my utmost empathy,my love and my hopes that Max can hang on in there, you and Max will be in my daily thoughts, take care and HUGS.