Using live game fish as bait (walleye, perch, sunfish) is illegal in Ontario and if caught are some serious fines, perhaps even having your licence taken away. I would advise against it. I've witnessed a guy on Mountsberg Conservation area get a $450 ticket for using perch under a bobber for pike. Salmontrutta brings up a good point that I don't know the answer to: if it's dead can it be used as bait? At the very least it would be counted against your limit. I think suckers are OK, I know they use 'em in the States, but would have to look into the regs to be sure.
Musky are the fish of a thousand casts so don't get discouraged. You already know where she lives, that's half the battle. I would revisit the area at different times, perhaps note moon rise/set periods, low light hours around dawn and dusk is good. Hell, for a good musky I'd give it a go anytime of day, even at night. If she doesn't eat then, come back later. Further, you may be onto something getting a strike with the Mepps Musky Killer. The steak I wouldve eaten myself as you're only upping the profile of the bait, unless tigers prefer AAA grade medium rare lol. It seems attracted to the displacement of the water the big blades are making. Try double 8 or 10 blades. perhaps but a twisty tail grub on the back to up the profile. Long casts, high speed and do a lot of figure 8s boatside. sometimes if you dont see her following she'll be close by and strike on the 8. Good luck.
This '47 was caught the same way. I knew where she lived, seen her before, just had to play around with time and lure. After trying evenings and mornings on the same spot, I went back on an overcast day at like 1pm with a smaller crankbait. I'm on shore because I was in a canoe and didnt want to swim with her tryiong to land it lol. I know she looks beat up boys but I assure you she swam away. With musky im 100% CPR. Here's a release shot.
Worth getting your shoes wet.