What is your go-to scent to make mock scrapes? Also, when do you start using doe-in-heat scents?

Scrape Generator from Buck Bomb along with their forehead gland.  In my opinion, the forehead gland is the key component that most mock scrapes are missing.

As for estrus lures, I usually break those out the last week in October or so.  I watched a doe get bred on 10/28 a few years back, so that's when it's go-time for me.