I get the 20 minute rule. About 2 months ago basically the chain would move along nicely and if it stalled for 20 minutes wiz would mine a diff=1 block. PortlandHodl has an asic so he donates some hash to keep it ticking along. But spoofing 2 hours forward, I dont think is in the spirit of things. And what seems to be happening is that every diff adjustment we are getting high % increase (double digit or 90% sometimes). I think its good to play around on, because we are going to have a lot of problems when the block subsidy goes away, so this gives us some early warning of what sort of things can be done. If that makes sense.