What to do when perturbation "Precise" is not enough?

Usually these artifacts go away after I turn up the perturbation precision, but this location and angle combination seems to be an exception. Is it possible to turn off perturbation on a per-layer or per-parameter basis? Or globally?

Fractal1 {
fractal:
  width=1536 height=1536 layers=1
layer:
  opacity=100
mapping:
  center=-1.7400623825793405635827908259941757369297972030492780630914\
  117871988894103336820246530005/0.02817533977920975947536701632090595\
  670078299803376372768789638501726158082626126225185322
  magn=6.0069688E77 angle=-86.1212
formula:
  maxiter=20000 filename="Standard.ufm" entry="Mandelbrot" p_bailout=1e10
outside:
  transfer=sqrt filename="Standard.ucl" entry="Smooth"
}

I'd have to say that this is a flaw in the current version of Ultra Fractal. I planned to have a global setting, but it's currently only available from the Registry. I'll look into why it fails in this example, and also see if I can add an option to turn perturbation off.