Hand grenade question!... it seems.
Thanks for all the input. Firstly I will not be running the 3/8 PS3 chain on the tuning kit, it only goes up to 16". This is because my 201T runs a 14" bar, so I have little to gain running a 16" version of that chain, albeit it is a rippppper.
I don't want to push the saw too far, I believe 18" is the suggested max length, to run a 20" with a 3/8 would be too much for the saw I would assume, which takes us even back to the 18", one could argue the .325 on 18" better for the saw than a 3/8, but a 16" with a 3/8 would be suitable. I won't be taking on big work and need speed, I am not a logger or even a tree surgeon but a gardener with the capabilties to rid the garden of the odd tree or hideous line of over grown fir trees that can develop meaty trunks. When the 201T runs out of size I have the MS261 to take over, taking bigger trunks and bucking them the likely use, everything else the 201T should handle.
Therefore a smoother less torquey required .325 on an 18" bar more than suitable for my needs? This smoothness perhaps starts to get onto safety (less grabby), added to another suggestion of running the RM over the RS, less kickback, but added benefit of not needing to sharpen as much or sensitivity to sharpening less. It can get dirty around soil level when taking stumps low so again sensitivity to dirt less on the RM. I could even go as far as RM3 for more safety but would I sacrifice some plunge capability with the RM3 due to its kickback protection?
So the 18" .325 RS is the standard for this saw, but its designed use is not quite my work requirement (you could say I started off with the wrong saw, but I got it for a good price on ebay and it was chunky for possible bigger work I might get), however changing the RS to a RM or RM3 would benefit me in smoother cutting, sharpen less, more resistence to blunting???
I also do not benefit in any way regards matching pitch to other saws (201T on a 3/8 PS3 and Pole on a 1/4 PM3) for sharpening tools etc by converting to 3/8 from the stock .325, and given my amount of use and bigger bar .325 does the job?
I also have no sensitivity to spend on a conversion so I would be free to go 3/8 if I wanted as I need bar and sprocket no matter what I do....oh but I would need another file and holder, so I don't see the need to go there, just stick with .325