If you are looking for more power, get a more powerful amp (or very efficient loudspeakers). Doing what you are suggesting is not going to give you the results you are looking for.
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"...Did I say I was looking for more power?..."
No, you didn't, nor did you tell us the reason you want to use bi-wire and both taps. I was just guessing. Still am.
If you run both taps on most receivers, it will run the amp at half the impedance. Probably not a good idea on an old amp. There is really no need and you will not get any benefit out of it. The other thing to consider is that a better single run of cable will sound better than two runs of a lessor cable. I hope something I said helps but I'm still in the dark.
I assume I can use both A and B sets?Yes, you can use both A and B.
The speakers selector on your NAD 7020 Receiver will works as a jumper, you need to switch the speakers selector to A+B.
If your adding two amps sources to your speakers, make sure you remove the jumpers from the speakers, ay. I know it something you thought of. BUT some folks forget and leave the jumper in. It is ok if you Bi-wire, but not if you Bi-amp.. That can cause a problem.. I'm guessing that's what your doing..
In any case the heavier of the two cables use that for the bass section..