I think you have to use your ears to judge the validity of the results and experiment with the different curves.
Absolutely. Honestly, you shouldn’t be asking us if it sounds better or not. You should be telling us if it is. :) Of course purists will rage against any EQ at all, and find some reason to make you question your choices, but I find their arguments only focus on tiny, possible negatives and ignore significant, actual benefits.
One thing I’d love to know from you is how you feel the preamp sounds using this path? I’ve found the preamp sections in Luxman integrateds to be absolutely outstanding and comparable to their stand-alone brethren. Excellent extension in bass and treble, liquid midrange. How has the introduction of a miniDSP in the chain between preamp and amp affected any of this for you?
The only thing I’d add here is that I’m looking into a Dirac alternative, Audiolense from Juice. Besides being cheaper than Dirac, it supports miniDSP and Roon. The advantage with Roon is the ability to do corrections entirely in the digital domain, while leaving the signal from DAC to integrated untouched. Since I’m a digital only person this pathway is perfect for me.