I dont know how important but I have C: before ACATune
Also the Maprom seems to be case sensitive including the line System: (you might need to make the S lower case or try dh0: instead.
Some Kickstart are not supported like Amiga Forever.
Also I found any error in the line an all ACATune commands seem to be ignored!
To add the Ram you just need to run ACATune, open CLI and type ACATune you might need to do a soft reset to see of your Memory is added.
Also be sure that you added ACATune to C: in the first place!
My final advice, try first with just:
Tell me if your Ram shows up.
At any time in Workbench you can open CLI and type:
ACATune -Status to show you what options are being used.