[Elecraft] K2/KPA100 Question

[Curt]

I built K2 s/n 06424 with KSB2 awhile ago, and am considering adding a 
KPA100.  Wonder whether this will just foul up a good radio.  I recall 
reading about oscillation and other problems with the 100W addition to the 
K2.   Now, I am using a 30 year old radio for QRO SSB, but of course it 
lacks WARC and takes up a lot of space I'd like to reclaim.

Appreciate knowing whether the issues have been ironed out and any advice 
about making this change.  In particular, I have talked on air with a friend 
who owns a K2/100 and his SSB signal on 40M is always weaker than any other 
rig he uses.  Will the KSB2 need to be reconfigured after adding a KPA100? 
I'm mostly a CW op, but like to work phone sometimes also.

Also, what else would I need to add to facilitate computer control and 
PSK31(which I only use rarely) using the K2/LPA100.   My ultimate goal is a 
single small size rig and laptop on the desk, with everything else clear.

Bottom line, is adding a 100W amp to what was originally a great QRP rig 
just asking for trouble?

72/73 Curt KB5JO