We use a PAR system and I write directly on the shelf tag what the PAR is. I will tell you that you will still have stuff to send back, probably not quite as much. It works ok, and like you I have issues while I am away on vacation and such too. They have gotten better over the years. The other thing I always try to remember is that I do not know how it looked when the order was placed because I did not do the order. Things happen, even when I place the order (the bin is empty but when I go to do the order there is more than there should be for a variety of reasons - ordered qty plus one or 2). I know that is frustrating...just keep the smile on your face.
Utilize ROP and ROQ provided from McKesson Connect. These are based on settings you have to adjust. Look under Order > Administration. Then, have McKesson print labels with Par and Max showing.
