OFC NOT. 1200's KS has AGA graphics.library that wouldn't work on your ECS Amiga.
Why don't you try this command:
C:ACATune -maprom devs:kickstarts/kick40063.A600 -cache on -burst on >NIL:
I'm not familiar with the usage of -maxmem option
Edit: Ok I know read the manual and saw that in order to get more than 5MB you need to add this option as well.
Just add it to the command I guess and will be ok
Now if accelerator is ultra stable as it should despite the hotness of the 020 CPU, only Jens can tell
I just adviced after you telling that once you lifted the keyboard, the memory errors decreased