Formatting Future Values in Matrix Visual Dynamically

Hi,

I've managed to successfully format future values (in RED) in my Matrix table below but not in a dynamic way, can anyone suggest a better way of doing this because I will need to manually change the conditional formatting criteria every month with the current method.

Current Method uses the 3315 Original Forecast value for Aug (last month) which I would need to physically change each month:

I'm not sure how to do this with measures.

The existing ones are:

Actual incl Projected = SUM(Modelling[Cumulative])

% Difference = 
([Actual incl Projected]-[Original Forecast]) / [Last Value Forecast]

Original Forecast = 
    VAR _firstdate = 
            CALCULATE(MIN('Total Closures'[Month]),
            FILTER('Modelling','Modelling'[Forecast] <> BLANK() )
            )
    RETURN
        CALCULATE(
                MIN('Modelling'[Forecast]),
                FILTER ('Modelling', Modelling[Month] = _firstdate)
        )

Last Value Forecast = 
    VAR _lastdate = 
            CALCULATE(MAX('Total Closures'[Month]),
            FILTER('Modelling','Modelling'[Forecast] <> BLANK() )
            )
    RETURN
        CALCULATE(
                MAX('Modelling'[Forecast]),
                FILTER ('Modelling', Modelling[Month] = _lastdate)
        )

Modelling Table:

                          Original Forcast

Can anyone help?

Thanks