part of the reason 1+1+1 is adding up to less than 3 is that you have some recirculating currents that the individual legs see, but the total input does not. My earlier post was simplifying things somewhat.. I'd need to crack open the textbook to get a better answer.
Also, it IS totally possible to broaden the voltage curve to squeeze in more power.. some drivers call it a trapazoid curve option. I wouldn't mind trying that, maybe have it kick in when you floor it since noise/efficiency wouldn't really be a concern at that time.
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