As you are past the 100 mark you can backpeddle a little ,id now stop offering 8weekly, say 4 or 6 and stand firm,most will then grab at 6
A guy in my area set up this Spring who i hear was offering WEEKLY 1,2,3,4,5,6, etc whatever they wanted AND specific day of arrival AND texting the night before. in my opinion he was making a rod for his own back ,too chummy by far ,
i heard last week he has closed up, could be he was too flexible and got milked for his trouble
i really believe you should set your stall out and then stand by it