(edited by Knight In Shining Armor.1708)
Levvi's Device could use improvement
I can help with the first couple of issues you describe:
Position yourself facing down a slope and zoom in before you activate the device. Hit I to open inventory, double click the device, instantly hit I again. (If I is your hotkey, that is). The panel closes and you get a good quick view of the beast shapes.
For what maps to go to, well, after I’d attempted it a few times I just learned where to go. Not every map that could spawn one, just the ones that the most players were using (eg se Mount M for shark). On rotation, I copied Dulfy’s line on it into chat; you can /w yourself to have it saved in pink for quick reference.
I agree these are work arounds and the device could have a much easier interface, but maybe they can help you deal with the issues it’s giving you.