I have made a ethoslab dark room grinder but the results are not very good. it's like the spawn rate is in the tutorial but it's low. and all the caves are lit up.I can't extend the grinder in front or back. because in front I have have a skeleton spawner trap. and in the back I can't move the mobavator. so I can only extend from the sides.how many pads I should make to get high spawn rate???note: the pads in the grinder is 14 by 14.and my second problem is the ender mans keep taking the blocks from the spawning pads(I am using grass)if I changed the block type is it will effect on the spawn rate???