Handling Billing Period for Prior Month

The above graph is what I'm dealing with. The Net Agreements - Month needs to be shifted to the left one month. The two measures I posted above are what create the graph (swap the word account for agreement). I use a calendar date relationship for the axis. 

A sample of my data would simply be this:

Note: PERIOD DATE is being polulated from billing period in power query with Date.From(Text.From([SI_PRD])&"01", "de-DE").

And then I have the two measures:

One to get my net added accounts from the previous billing period,

Net Accounts - Month = 
VAR TIMEFRAME =
	CALCULATE(
		DISTINCTCOUNT('billing_table'[account_number]),
		DATEADD('Calendar'[Date], -1, MONTH)
	)
RETURN
	DISTINCTCOUNT('billing_table'[account_number]) - TIMEFRAME

And then one to get my new account by date added (notice this one uses a different date relationship),

New Agreements - Month = 
	CALCULATE(
        [Net Accounts],
		USERELATIONSHIP('Calendar'[Date], billing_table[account_add_date])
	)

Along with a date reference table (Calendar) that has an active relationship to the PERIOD DATE and an inactive realtionship to the account_add_date.

I think that is everything. I'm not sure how much clearer I can be. It seems like what I want to do should be fairly straight forward and easy. I can't really upload any sample pbix files because I'm connnected to a live database. I suppose I could recreate one if need be.