Really? I wonder if the hardware on the 2014 models (i.e., camera resolution) was that much worse than current production or if Canadian speed limit signs are harder to read/interpret by the system. I did my first real road test of AP this weekend, and I don't think the car missed a single speed limit sign (including all of the construction zone signs). I don't think that the car was using Google Maps info for speed limits because on many roads, the speed limit didn't show up on the dash until I passed a sign. Do the roads that you concerned about not have speed limit signs? If the do have signs, I would be very surprised if the car missed them...especially by 30 kmh. Perhaps better recognition of speed limit signs was included in one of the firmware upgrades after people complained about 7.1 limiting the speed to an incorrect limit.
As for the nags, I think I only had 1 or 2 nags over the course of 300 miles of driving that weren't immediately after a turn in the road or some sort of unusual lane line divergence. It sounds like the 7.0 AP still had nags after complex road geometry, but they just added a few on long straight sections to make sure that you are awake and alert. Just seems reasonable to me given the Josh Brown wreck.