From 12ft lb a bit extra IS significant, despite what some may suggest, even 1 or 2 lbs. 2lb is nearly 17% more powerful, noticeable for sure. 18ft lb is 50% MORE than 12 and you WILL notice an improvement, that doesn't mean you necessarily need it, or have 50% more range or stopping power, but you will notice for sure and it can be very useful!!
Drifting from topic a bit but worth thinking about!