The following timing settings are recommended for CW:
If CW Key-down Delay of less than 50 ms is needed/desired, change HL2 capacitor B109 from 100nF to 10nF. For background, refer to the following thread: PA Bias power up time improvement
Taka-san, JI1UDD's documentation of the issue and fix: PA Bias Power Up Time Improvement, PA Bias Long Rise Time, and PA Bias Short Rise Time