Ummm when you use the nin log it tends to put your chakra in the negatives and it takes for ever to rest. Im shure this is a bug but just thought id let you know.
I'm saying this now, and I'll be making a guide which says this:
THAT IS TO CONVINCE YOU ALL NOT TO USE NIN LOGS OFF THE BAT! If you want to use Nin-Logs, wait until your chakra's in the 10k area first, then it starts recovering fast.