The slot is pretty substantial too. I believe its a low percent of fish even fall above the limit. I spent 3 days on Nippissing (calander bay) and caught 1 fish, lots of guys I went with caught zero. We were out with a ice hut company. I went with 16 people and I think in total out of 16 people we caught 8 fish over 3 days.
I also went when North Bay had the cold snap of -20 for 3 days.
Edit:Where I was, Calendar Bay, was about 3 hours exactly, and I live north of Mississauaga, so it would probably be around 3.5-4 hour drive. Thats a lot of driving for one day of fishing. There are a ton of lakes with operators a lot closer. Go to Simcoe for perch or trout with an operator.