RE: Windsong vs Jade Spirit: we simulated all of the proc'd enchants and you can see the
results here. If you use Jade Spirit, your score actually goes up
However, that might change with 5.1 since the Jade Spirit mechanic to a real PPM as well (it will likely get even better, but you never know). Anyway, when you switch enchants, the reforges change because it affects your haste (and sometimes other stats). That's why Mr. Robot looks at new reforge setups. That said, both reforge options are incredibly close (less that 0.1% apart), so either way is excellent.