So I did my big overhaul (New crank,BB, Cassette, and chain), all the youtube videos and a genuine bike repair book will not help me properly setup the rear derailleur. I think after two evenings of messing around and not getting the rear derailleur to shift properly I think it's most likely the fact that I replaced a chain for the first time in my infancy of fixing my bike, and think despite watching a youtube video of the process, made it too short. When it's setup the best with the new chain, it will skip a cog, jump around a little, and depending on the cog will sound like its trying to shift… There are so many variations as well, some that use the barrel adjusters and those that don't. Either way, looking at the jockey of the rear derailleur, it looks like it's far too stretched out. But I don't really have a frame of reference. All the youtube vids and pictures in the book are so close up I can't tell. Below is a picture of the derailleur with the biggest chainring and largest cog. If its not the chain hurray, I've saved $80…. Thanks in advance for any help.