[Elecraft] K2 ALC action

[W6IZT at aol.com]

I am seeing an ALC action from my K2 that I don't understand
 
When I key my amp (Command Tech HF2500) with my K2 (sn 3188 all mods  
performed) I see the grid current on the amp cycling between 3 distict  steps.
 
For example:
 
-When I first key the radio with a continuous carries the amp will show 30  
ma of grid current, increasing to 40 ma over the next second or so.
-The grid current will then immediately drop to 20ma and increase to approx  
28 ma over the next second or or so
-This repeats one more time.
 
I also see this when sending a continuous string of dits
 
The input VSWR to the amp is 1.3:1
 
I do not see this effect with any other radio
 
I'd liek to understand why this effect is happening and how it can be  
eliminated. Any help is greatly appriciates
 
73
Gregg
W6IZT