A little late but I ran into this exact same issue and finally got it to work. Maybe it's obvious but make sure you are using the correct action replay code to the region of the rom, screenshot from the source code:
For example, if you patched the USA version of Phantom Hourglass, use the AR...
I may try the new ram site, and download more RAM to my Switch. Not sure if ddr3 is the right ram
for it tho. Edit- no it uses floppy Ram, just like @AncientBoi