I had a few generations of verrucosus. I had best results with
2 months constant 23-26 degrees Celsius
2 months constant 10-18 degrees
increase by 1 or 2 degrees per week to the final temperature
the rest of the incubation at 24-26 degrees
the jump between the first and the second period is not important; however increasing temperature from the "winter part" of the incubation to the final temperature caused eggs dying.
Total length of incubation is approx 8 months.
For comparison, constant 24 degrees led to 5% succes after 14 months.