Choosing an HVAC system baseline for a Manufacturing Facility

We are working on a manufacturing facility for which we are trying to choose the accurate HVAC baseline system for energy modelling. According to ASHRAE 90.1 2007 Table G.3.1.1A, looking at our conditioned areas, number of floors, usage and heating source as specified in Table G 3.1.1A, we need to choose "System 6 – Packaged VAV with PFP Boxes" as the predominant HVAC system. We have high thermal loads in certain conditioned zones of the Process spaces. These Spaces make up 44% of the total conditional space area of the facility. Therefore, we wish to avail of G 3.1.1 Exception (a) to “Use an additional system type for the non-predominant conditions” for these spaces as they are more than 1900 Sq. M as required by Exception (a). Further we would like to avail of G3.1.1 Exception (b) to choose "System 4 –PSZ –HP" as our baseline for these Process Spaces under discussion here. It is our understanding that we are allowed to do that as per this interpretation from ASHRAE dated “Interpretation 90.1-2007-05 - January 23, 2010” on their website: https://www.ashrae.org/standards-research--technology/standards-interpretations/interpretation-for-standard-90-1-2007 This interpretation says we can apply System 4 as the baseline for these process spaces as long they form the "lesser portion" of the building but doesnt specify a limitation on how less they have to be. Since the rest of the conditioned spaces of the building make up for 56% of the total conditioned area, Are we good to go with this methodology for choosing System 4 for the Process spaces? Thanks. Ashwin Kumar