Motivations behind "Free Grace"

Wesley lived in an interesting time in the Church. The Church of England had finally settled down after constant conflict over the doctrines and influences on the church. Yet Wesley at this time was still committed to the Anglican church, and as such was caught in the middle of the identity crisis over what the church should believe. I find it fascinating that the issues of predestination came up this early into his post Aldersgate ministry. Was this something that was coming up often while traveling as a revivalist? Was he trying to beat back the Calvinist influence, even though some level of free exercise was permissible outside the Church of England? How would this conversation come up? Was this sermon a counter to someone in particular, or a preemptive move? The context around this sermon is something we must exam going forward.