Hello SpiderKenny,
I checked the code you posted above and I think I found what's causing you problems, or at least some info that can actually be of help. If you check this link you will find a table that explains the mapping for the Gen2 MUX, according to it you should select the value for gpio60 on LOW instead of HIGH and there's no need of unexporting it. You can check the link above there's a lot of info you can find of help there.
Regards,
Peter