PCMCIA works without having to set the jumper to 4MB 
When it works I assume PCMCIA SRAM might still cause a problem
Using LoadModule won't work cause the newer versions of card.resource and carddisk.device are already being loaded from the original 3.1 Kickstart so it will give you an error that they're already loaded and can't load the ones you trying.
Are there no other tools that could load older modules?
you are great man !!!
I inserted this lines after setpatch and OS3.9 works with Kickstart 3.0
Its Alive! - and they said it could never happen
I doubt they cared about setting 3.1 roms or a1200's, they wouldn't have received any money from that.
I think Amiga Inc would but anyways who cares
Im just glad Laser it works for you

for me OS3.9 in 16 colour is faster than 3.0 with lots of Patches and I like the Doc bar,Unarc..........
What gadtools progs are not working this might be one the limitation I mentioned

maybe loading a single module could fix this