Ive never used this method of baiting but seems like a good idea ...if its working don't fix it ,just plan on filling more often ..maybe reduce size of the hole to 3/4" . Adding water you run the risk of sprouting the oats or molding them ,neither will allow them to run . Molasses would have to be used in very small amount and mixed thoroughly or it would cake ..Good luck and let us know how you solve it .
Sent from my SM-A520W using Tapatalk