I am not sure what a Sage Rat is but we have had such a bad rat problem at our house in Houston that I finally called a professional. The adults are HUGE 14” to 16” long from nose to tip of tail. I have heard of peanut butter mixed with oatmeal but raw bacon and the big wooden traps is best. You should rub your hands with the raw bacon before handling the traps.
It did hit one of my baits last night and should be feeling mighty poorly about now.