Make sure you are using a good fluid that won't boil so quickly like the OEM.
I think most of us are using the Motul 660 which is a High Performance brake fluid with very high dry boiling point of 617°F (325°C) and wet boiling point of 400°F (204°C). For all types of hydraulic brake and clutch... just saying...
Here is the comparison between the 600 and 660 "RBF 660 Factory Line features a dry boiling point of 325°C, higher than RBF 600 Factory Line. ... It maintains a higher dry and wet boiling point of 272°C and 185°C respectively compared to DOT3&4 and DOT 4 brake fluids.