[Elecraft] XV144 down to 2W out

[Rajiv Dewan, N2RD]

What is simplest way to turn down the max power out from a XV144 from 15 
to 2W?  I use a K2 and tried to turn down the power by reducing the 
drive from K2 from the nominal 1.0mw down to 0.02mw but this did not 
work reliably.  Should I be adjusting R22 on XV144, the input 
attenuation adjustment, instead?

Thanks,
Raj, N2RD