Papulatus can spawn 2 different kinds of bombs; stationary bombs that hit ~8k and mobile ones that hit ~4k. He is supposed to spawn the stationary bombs exclusively on the top and the mobiles ones exclusively on the bottom, however, he is spawning both types of bombs on both levels, making anyone sub 8k hp unable to do Pap without heavy washing or HB.
This is already in the bugs list here: http://royals.ms/forum/showthread.php?t=889 Although I cannot find a single specific thread for the issue so I will leave this open. Currently we are unsure on how to fix this issue.
As Manslut suggested, total removal of the bombs seems like a solid temporary fix. When they're spawning in correct places, it hardly does anything to make the fight more challenging anyways.