During the cooldown orders executed fast because the "no funds" asks couldnt be placed so they weren't recalculated.But they are still there so now they are recalculated after the trading began.That's why the lag is still building.I hope someone is investigating witch accounts place this orders because this will go on forever.The 17 april change is clearly needed although bots from many account will still be able to place many orders to replicate the effect so there should be some kind of limit on the number especialy of small orders witch are clearly suspicious when placed in large quantity.