Hi snutten,
Welcome to the forum too (though I'm a newcomer myself).
hope you didn't mind my theorising about your loops and possible improvements. Just noticed that you said you had your DDC undervolted running your secondary loop. Have you swapped your pumps about in the different loops? With a block and rad in series , then having two of these combos running in parallel I wonder what would happen if you had your DDc on your primary loop and your 1048 in your secondary loop. If you've tried this I'd be interested to know what you found?
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though its only my opinion which <= sqrt(FA)
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