we'll have to develop a resistance to coinchoose/coinwarz and multipools. Perhaps a readjust that pushes diff up sharply if 5 blocks are solved in under 2 minutes, by a factor of 5? that should instantly kick off the multipools. Then if a block is not solved in 20~30 minutes difficulty reverts to previous level?
Yeah, the core idea in the suggested solution is to give up on fixed retarget intervals. Every block becomes a potential retarget point depending on how fast/slow the last N blocks get found. N needs to be picked so it is high enough to compensate variance, but small enough to react to network spikes.