[Elecraft] K3S - To Tune or Not to Tune - That is the question

[Jim - N4ST]

I have a K3S with the built-in antenna matching unit.
I have a variety of wire antennas strung through the trees.
For SWR below 1.5 or so, I bypass the antenna matching unit.
But at higher SWRs, I use it to reduce the strain on the finals.
Question is, at what SWR do folks start using the matching unit?
Bypassing the matching unit avoids inherent losses, but is it putting a
strain on the finals?
Can I just monitor the PA Temp as a guideline as long as I'm getting the
desired output power?
I primarily operate 25-50 watts digital modes these days.

________________ 
73,
Jim - N4ST