Quick fix to run after you have set base % desired between 1 and 100.
Code:
UPDATE PS_GameDefs.dbo.MobItems
SET DropRate=DropRate*10000
WHERE ItemOrder IN (7,8,9)
AND DropRate < 101 AND DropRate > 0
Explained :
Adjust drop rates
SET DropRate=DropRate*10000
Choose which to effect
WHERE ItemOrder IN (7,8,9)
Insure you only effect standard percent drop rates
AND DropRate < 101 AND DropRate > 0