Try OS6 with my prop, see if it fixes. OS5.9 is “ancient” by today’s standards IMHO.
https://fredrik.hubbe.net/lightsaber/proffieos.html
if you’re unsure of defines, try the new tool out: Alpha Testing - New ProffieOS Config Helper Tool
The tool will let you just generate CONFIG_TOP section and you can leave rest of config from OS5 the same for testing.