In my experience, autolysis takes longer than 3-4 weeks to become a problem. The only reason I secondary is if I want to add something to the beer - fruit, dry hops, etc. Sometimes I just "secondary" in the keg, like with my Spanish cedar pale ale. I don't worry much about clarity, I use a racking cane and leave the sediment behind. Any that ends up in the keg will blow off with the first couple of beers anyway.