Mc-abc and unequal modulation

Let’s say you have a 6 GHz PTP820C using MC-ABC, and radio 1 maintains 2048QAM, but radio 2 sometimes drops to 1024 or 512QAM. What will the throughput be?

I assumed it would be 2 times the lower modulation, maybe a little less because of the hashing algorithm. But I swear I’m seeing more than that, as if it sends more data over the higher modulation path.

Anybody know the correct answer?