You can set the AC compressor disengage in the tune to keep it engaged longer, and the customers running these in road racing are pleased.
A biger HE will not help if using the chiller as were bypassing the HE whenever it is engaged as we cant chill the entire outside. A large resivoir tank is a must though for stored chilled coolant so less fluctuations.
Skylane,
all fittings are Automotive HVAC type. The killer chiller is the system using plumbing fittings, etc.