I have 2 suggestions, either 1 can be use (using both may seems too OP)
1. change pet drop to be per 6 hours, yield (lv)² amount of item. this will remain unchanged for lv6 pet compare to what we have now, but Lv7 will get 7 more per 6 hours ( 28 item more per day ). HOWEVER this will weaken pet in lv1 to lv5 and Lv5 owl will become pretty useless
OR
2. allow to star 1 item in lv7, 2 additional items in lv8 and 3 additional items in lv9. Stared item will drop double when drop. This will lead to average 14 more item drop per day, which is your choice of item in lv7
the first option is aim for increase in quantity, second option is mainly aim to increase in quality
