Interesting project. Reminds me of the days when 134a was new and everyone was trying to run it in r12 systems. They didn't cool well because the condensers were too small and inefficient but mainly due to 134a needing a good bit higher cfm pump.
With yours it's an odd mismatch however if it's not using as much electricity and it's keeping the house cool and not overheating the compressor then just run it.
Your old one dying at 12 years is about the norm. Here we expect 10 years then anything past that it's on borrowed time. Due to our cooling loads and how much abuse compressors get in the summer is why I'm not the biggest fan of heat pumps. I don't like running a compressor any more than I have to.
What's the humidity in the house now. Preferably 50% or less. Ours is usually around 45% to 48%. Also what is your supply and return temps after its stabilized for 10 minutes or so.
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