Stinger Size

I have been using #10 stingers on 15 pound test mono for quite awhile now. The past couple of weeks this combo was resulting in only about 50 - 60% landing rate. Both weeks a switch to #8 stingers resulted in 100% landing rates of hook-ups. This past weekend I explored various parts of system all the way from the Ambassador to the Blue Water Bridge to keep these six (20 -26 inches).
What size stingers do you use?

<----<<<

Stinger Size