Hi Michael,
Yes, I did read it, and I tried a few different solutions without luck. The main issue is, that detecting mobile devices on the server side is very difficult, almost impossible. There is a mobile detection class implemented within the plugin, that I was testing this with, for most cases that works. Please note, because this is a server side detection, simply resizing your browser to a mobile size window will not change anything. It will only work on real mobile devices only (mostly android/apple phones).
Change the $title_limit_mobile variable for the mobile version of the title limit.