I feel, this coin has some hidden issues,
I have tried to test

      600khs   4 days          16 blocks       4 blocks/day :: expected as 22 blocks for 4 days
     2000khs  1.5 days         9 blocks       6 blocks/day  :: expected as 12 blocks for 1.5 days
   30000khs   multipool                   15~16 blocks/day :: expected as 160 blocks / day

network hash rate is around 300-500Mhps

If calculate the actual number of block has been generated, it is matched,
but, the actual mining blocks are not matched,

I pretty sure, it has some hidden issues,