I bumped the probability of mine up to 18 and noticed a pretty major increase in drop rates.
Code:
SELECT `a`.* FROM `loottable_entries` `a`
INNER JOIN `loottable` `b` ON `b`.`id` = `a`.`loottable_id`
INNER JOIN `global_loot` `c` ON `c`.`loottable_id` = `b`.`id`
Note: I have the 'accoutrements' added to my database..should only be about half of those results.