I found that no one website can even begin to cover all the variations of TOS .

I think my version must be mostly due to sticky myofascial tissues - because when I keep up with my self care and stretches and ergonomics I do OK.

But as soon as I skip them for a week or do heavy/intense projects - I can feel bad things starting to happen
my typing gets really bad and I hit all the wrong letters as well as getting sore and achy - if I continue on without doing any self care- then the trigger points will start to appear.

Sooo If you ever can get to a place when you feel good -
Do not slack off - keep up with what helped you to feel good and stay with it.

DiMarie has a good explanation why EMG don't really work to show TOS
something about the small nerve or sensory nerves don't get tested only the major nerves & if the problem is in the smaller nerves it doesn't show up.
just my quickie version...as I can recall it