These values should be handled as the standard linux permissions with the difference that you need to subtract your desired permission from 7. This means if you want to set 0777 you have to use 0000 (which means everybody is allowed to read write and execute).
Set this for testing purpose and if this works start limiting by changing the numbers.
After few tests / reboots, issue has started again (no permissions) even with about fix with updating rc.local.
Now got new fix, looks like working stable since couple of days.
Deleted mount related config in FSTAB. (btw - fmask / dmask really is not getting applied from fstab only umask parameter seems to be working, but couldnt fix Writer permissions to all with umask)
Deleted additional startup (rc.local) using link in above post.
Enabled anonymous mount from Luci web page for mount points.
Deleted package ‘kmod-fs-ntfs’ based on below post.
Now its working fine. Any new HDDs / thumb drives are showing with full permissions.