I think it's both the limits (which aren't based on reality), and the amount of the fines (which are too high compared with motor vehicle infractions). Both issues should be tackled together, potentially by a qualified individual who we could call a Cycling Coordinator.
It's kind of the same as the problem with playground zones, where the tickets are a symptom of poor road design. Just like you can't blame people for speeding through when the roads are designed for 80km/h, you can't blame cyclists for ripping through Fish Creek park at 30-35km/h when the sightlines are good and the pathways are empty at seven in the morning. And it's the same in the slow zones, where riding at 10km/h is a wobbly, hard to control bike (read: less safe).
Review the limits across the whole city (with real data). Raise the limits where it makes sense, lower them where things are congested or sightlines are poor. Maybe they could even be variable based on time of day. Then develop a fine structure to enforce the whole thing. Increasing the fines by 8x and calling it a win for safety makes it painfully obvious that there was no thought put into this whatsoever.
