Hey Martin, thanks for the tips, this make things a lot easier, although I did notice some things along the way, but I'm on an older firmware so it might be different (this script is also a bit of a mess):

1. Editing the /etc/config/cgminer file had no effect on my speeds, the asic-freq file seems to override it
2. $APP didn't change anything either, I found that only editing AOPTIONS made any difference. Making changes and looking in the system log seems to confirm this.
3. when using --bitmain-auto, my ant won't hash, it connects and all, but won't hash (as mentioned I'm on older firmware), does "--bitmain-auto" actually show up in your system log?
4. I added the --balance parameter to the PARAMS string, but that's just me being pedantic

I also noticed a non-related problem with ntp never working properly and found that at the bottom of the init.d/cgminer file, there are leading digits and points before the addresses which breaks the script. I removed them (0.openwrt.org) and finally ntp seems to work

Thanks again for sharing!