One way to get your Wrench to gobble up slack is to make sure that you set up your tether so that it allows the Wrench to sit down when ascending or taking up slack. All the tethers I have used try and force the Wrench upwards which puts a bend it the rope even when ascending. Most do it through some sort of rubber grommet on the top of the tether, or in the case of the Reon Rounds tether he uses a spring. I myself run the ISC short tethers and you can see from the picture that I remove the rubber grommet which lets the wrench sit all the way down during ascent and the rope to fall through the wrench unimpeded (stock on left, modified on right). This tether setup with a 4 wrap Michoacan almost feels like a mechanical in its ability to eat slack. Some worry about the Wrench engaging with the grommet removed but I have not found it to be an issue. You can also simply start removing small sections of the grommet until you get the tether to function the way you like it. For me I like it best with it completely gone. YMMV of coarse.
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