The only thing I didn't strip was the cylinder assembly but I sprayed that too and re-lubed. The wheel now spins for a full 10 seconds before coming to a stop and the trigger pull is smooth throughout.
Sounds like you're good to go!
Some years back, a friend brought me an SP101 (somewhat similar mechanism to the RedHawk) the cylinder could only be turned by hand, pulling the trigger wasn't enough. With the cylinder open, it could be turned by hand, but would not spin.
He brought it to me, hoping I could fix, or at least find the problem, without having the expense and especially the wait time going to a regular gunsmith.
The problem turned out to be a crud buildup on the cylinder axle (the crane), it was simply, completely gummed up, and a good cleaning returned it to full service, good as new. The rest of the gun was clean, it was gummed up "inside" the cylinder, where the owner either never thought, or didn't know to check and clean it there. I explained it all to my friend, and showed him how to deal with it. No idea how many rounds it too to get to that state, but its been several years, and I haven't seen that gun again, so maybe the lesson was learned.
Sounds like you are on top of the issue.
and sorry for not noting you were using magnum cases