I don't cut a tab back more than just short of my finger tips when curled on the string. A little shorter is fine, but I don't find it necessary. The shortest I have ever gone is just longer than the first joint in my middle finger when my hand is open with finger extended. I anchor very tight to the face and with thumb knuckle behind the jaw and index under the cheek bone. I had a face rub for a very short time. I believe it was the string and was due to insufficient deep hook particularly in the index finger in combination with not getting all three fingers to go limp on release. If you don't get your finger curled in well and relaxed at the release they don't blow open and get the string out. The string slips out off the finger tips and hits the face. Having your face turned into the string also is a culprit I think for people changing from a glove to a tab. You can get away with a lot of face turn into the string with the extra length of the gloves finer tips. I shoot a tab most all the time now, but I have been playing with a few gloves. I shot way left, right handed, with a glove. I have to turn my face more into the string to get my eye over the arrow.