Overtrained
Not crazy, Stoopid!
On the muffler mod . . .
There are two baffle plates and a screen inside the muffler that you can just completely remove.
Then it is just a matter of enlarging the outlet holes.
The muffler will fit back together without the baffle plates.
This leaves the muffler as a hollow box. The result is louder but it is a chainsaw.
I did my 3214 and it really came alive. Then I did a 3818 which had the same muffler but I didn't see so much improvement.
A Stihl "yellow" chain will help these a lot too. The cutters are larger.
Im assuming you have to set the carb a bit richer to run with the unrestricted exhaust....