TRANE/AMERICAN STANDARD TEM8 stage-1 CFM/ton

I am looking at a TRANE/AMERICAN STANDARD TEM8 4-ton air handler running in 24-volt mode. It can be AHRI matched with either SILVER 16 single-stage (current) or GOLD 17 two-stage outdoor unit.

I know my duct system is undersized for my house cooling load, which is confirmed at 4 tons by review of years of data stored by my ECOBEE thermostat.

I have read that the two-stage running in stage-1 operates at 70% level. By installing the two-stage outdoor unit, I can run at reduced static pressure a high percentage of the time.

I want to predict the percentage difference in static pressure between stage-1 and stage-2, and consider that benefit against the extra cost and complexity (repair risk) of the two-stage outdoor unit.

When setting the air handler control values, the stage-2 CFM/ton is input, and the fact that the outdoor unit is a two-stage compressor is input. There is no explicit setting for stage-1 CFM/ton.

Can you tell me the stage-1 CFM/ton if stage-2 CFM/ton is 350 CFM/ton? (Blower module prevents operation above 1400 CFM on my duct system.)

I am looking for an authoritative answer from manufacturer documentation, or from somebody who has measured in a hands-on situation.

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