A tclean vs clean comparison

Comparing tclean to clean with the following parameters:

clean(vis=vis0, imagename=myimagebase, field="", spw='',
      mode='mfs', outframe='LSRK', interpolation='linear',
      imagermode='mosaic', multiscale=multiscale, interactive=False,
      niter=1000, threshold='100mJy', imsize=imsize, minpb=0.5, cell=cell,
      phasecenter=phasecenter, weighting='briggs', usescratch=True,
      pbcor=True, robust=-2.0)

tclean(vis=vis0, imagename=myimagebase, field="", spw='',
       outframe='LSRK', interpolation='linear', gridder='mosaic',
       scales=multiscale, interactive=False, niter=1000,
       threshold='100mJy', imsize=imsize, mask='auto-pb', specmode='mfs',
       cell=cell, phasecenter=phasecenter, weighting='briggs', robust=-2.0)

Note the very bad cleaning instability creeping in in the clean image:

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