[Elecraft] K3s low power at first

[lmarion]

    All equipment factory  built/aligned  K3s to KPA500 using KAT500.  
Had the setup about 6 months now.
When first tuned up on any band SSB or CW mode, with 5 watts K3 drive,
  it takes a short transmission at 15 watts K3 drive for the amp to ramp up to 500 watts as read on the KPA500.
It stays at that level until a frequency or band change occurs. 
A short transmission and it ramps up to full output power again. 
  A  CW  ID  is usually sufficient to ramp the power up to 500 watts.

Is there a tweak that needs to be done, or should I leave well enough alone?

      Leroy AB7CE