I would like for it to be as efficient as sensibly possible.
May have missed it in a previous post, but have you looked at all the ramifications and advantages of the different changes? Versus bigger this or smaller that, etc.
For instance, have you researched Mollier diagrams and plotted out(or made up a spreadsheet) of how the COP of the system will change for each small independent revision to any given system? And then fine-tuning the charge with subcool and superheat calculations?
On own old 4T Rheem air-air heat pump, when time came to replace compressor, found that downsizing the compressor to a 2T compressor and revising charging for optimal subcool (e.g letting there be some liquid sit in bottom of the now oversized condenser) gve almost 3 T heating at higher COP.
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