I have an Epilog 75 Watt Ext and have had no trouble cutting thinner leathers. I have read a few threads on what speeds and power work for others and have tried all of those settings and making slight adjustments for my wattage with less than ok results. I have yet to cut through an 8oz piece without at least 10 passes. Can anyone help me narrow down the proper speed, power and frequency for my machine? Thanks in advance for any light you can shed on my issue!