We were there April 25-28. We had good fishing, but it was getting a bit too muddy up where we like to fish by the time we left. Still ended up with 20 pounds of Striper filets and 10 pounds of walleye filets!!!
I don't think you went too early. Personally, it gets too busy for me later than the end of April. It is a big and intimidating lake, send me a PM if you go again, I may be able to give some tips. My main one is don't have a rigid schedule. Keep your plans loose, and go when the weather is warming in late March or April and fish the stained water!!!