Hi George, put the LPD8 into CC mode(one of the 4 small buttons on the left side) and in Midi2lr right click on the LR command field and in the dialog box that pops-up set it to be absolute and the min 0 and max 4, that means even a light touch will trigger the command.
I would add all your buttons to Midi2lr and then use the "apply all" feature in dialog box to save time, only then add the encoder knobs and set them up.