It is much faster and easier to aspirate the epi-nucleus using the phaco probe than the I/A probe because the tip port opening is much larger. However, the phaco tip is metal and if it comes into contact with the posterior capsule, it can rupture it. The I/A tip is much more forgiving and is often made of a plastic polymer. The key to aspirating the epi-nucleus with the phaco probe is to use the second hand and the chopper instrument to flip up the epi-nuclear shell while protecting the posterior capsule. I use the same phaco machine settings as my phaco chop mode and then just titrate the vacuum and flow levels with the foot pedal control.
click below to learn how to safely and easily remove the epi-nucleus: