Perhaps the manufacturers may wish to comment on 'factory set' I seem to recall that most
In my view, whether spark plugs or TEV's, their adjustment is just simply the last thing to look at. The last thing to touch. Having your timing correct is primary, for example with an automobile engine. Knowing temperatures and pressures and such is primary with a refrigeration system.

Spark plugs fire pretty much okay from the factory, and TEV's feed pretty much okay from the factory.

Dan