I'm not a fan of chins, so my other option is implings at Puro Puro.
I do not believe that you get enough EXP from high end imps like Dragon imps and Lucky imps. On top of that, the spawn times are crazy long and there are not enough spawns for rares. If there are more than 2 people in Puro, it's almost like you never find rare imps at all.
Please make this appealable again by adding more imps and increasing spawn times.