First of -- welcome to the forums!! Glad that you are chiming in!
As for changing the name of the Save from Will to Resolve, I am sure that there are likely an equal number of arguments in both directions, which means that it comes down to personal aesthetics.
And to me, that means having the Save be Will, and the stat be resolve (I was never 100% happy using Willpower, but at the time of writing Novus, I had been unable to come up with a better alternative, and didn't want to simply use Will by itself). Having come down the road a bit from that initial writing/testing period, I find that I like resolve better as works well for defining a "strength of will" or "self discipline", etc...