my 2 cents
since they seem to be on the property or close by
I would try finding out where theyb are coming from
meaning, back track there trails and place cam's along the way
trying to bait a buck to come to you, is Never an easy eal, as time and weather changes, so does what they want to eat
so even if they hit"X" hard now
come hunting season they may NOT want it
Minerals are prime examples of this to me
what minerals a critter needs NOW, as opposed to fall, as to winter and spring all change, and so will how often they go to it

A good minerak block will last for weeks if not months, so YES it can lasta ton longer that other baits
but sweets like corn and apples and such, will always pull deer more often and pull just more deer to them
easy GOOD meals are always better deals than rock hard minerals!

if you can manage to back your trail cam's up and find maybe where they are staying closer, it too will also make maybe killing them easier too!, as they live by patterns many times and the less they have to change them the better your odds are of killing one! IMO