It really depends the tone you’re looking for. Electric Wizard and Eyehategod, for example, have a very different bass tone and both works pretty well.
I prefer the compressor just after the tuner but it depends how you use it. also I don’t think a noise gate is needed, and you could also look for a phaser if you’re into the psychedelic side of sludge.
Just for your information, my setup is pretty simple, I mostly use only a compressor and an OD/preamp (and a tuner, but that’s not really an effect as it does not effects the tone).
'hope it helps. 