Something does not add up in that situation. 80 hours to break 1.25 full poly setup at 4.0 level... Maybe you need to work a little more on your technique and worry a little less about how much hours you play or how long your strings last. Even with moderate power and spin you should break strings in like half of that time, and your arm should start hurting long before that. Or maybe it's not 4.0 level play/practice after all.
Breaking the sound barrier with my forehand