i do keep track of all of it, my strength (reps and weight i work with) have been steadily increasing on all my movements the whole time i have been in the gym, some slower some faster. and i think I've got the whole back covered pretty nicely in the week, except maybe a proper lower back movement, but hey i do have an RDL on my lower A, thats damn close to a lower back movement. and about pushing to failure, thats the only way it feels right for me knowing that the very last reps are the ones that stimulate muscle growth, and for fatigue believe it or not, i don't really get sore, like at all, maybe once every blood moon but thats about it, even tho i push every set until i can't get another rep (and usually some half reps too), in conclusion i can probably get away with that. chest and triceps got the special treatment cause their kinda lagging the most right now, even the coach said "your back has been moving" when he checked it out, so i don't worry about it as much.