item_drop_common_min: [value]
item_drop_common_max: [value]
[value] for every _min and _max drop.conf have range between 1 (0.00%) until 10000 (100.00%)
if you set them more than 10000, they will be set to default, 1
{ "item_drop_common_min", &battle_config.item_drop_common_min, 1, 1, 10000, },
is
{ [variable_name], &battle_config.[variable_name], [default_value], [min_value], [max_value], },
You don't need change the rates here, just need change them on your conf/battle/drop.conf
if you want to super high rate,
maybe the _min you can set for 8000 (every item has drop rate minimum 80%)
and the _max you can set for 10000 (every item has drop rate maximum 100%), they're mean that your server will has drop rate between 80%~100%, and you can try the _common and _boss rate with value that maybe you'd love. haha