Even though the way you have things currently set up you have space in between legs & back, those spaces are filled with training. So in that case you are not allowing yourself full systemic recovery. After a hardcore workout your brain is fried, you need time to recover all of those millions of neural connections in the brain. Also you need to have time to replenish your glycogen storages and flush your muscles with amino acids.
Try this out:
Day 1: Legs
Day 2: Bis tris and forearms
Day 3: Off
Day 4: Chest delts
Day 5: Back and traps
Day 6: Off
Day 7: Off
This will give you a more sound regimen in which you know what part you're working for each day of the week. I know the two off days at the end of the week are enough to drive you crazy, but this split is garunteed to give you adequate recovery time between parts. Which in turn will allow you to have maximum power output. This way you can hit 270 this week and maybe 290 next week; not 270 on a "good" day.
My program includes two bench press sessions because the chest needs to be stimulated twice per week in order to maximize power & strength. On the light day I'm working with 10reps with 245. Thats the hypertrophy day. Heavy bench day is all about raw power. Last week I worked with 2 sets for 2reps a piece with 325.
And about the M&F article, yes lack of endurance does play a part in muscle failure, but I believe overtraining is a far greater cause. Its like powerlifter Shawn O'Halloran says: "Be consistant, patient and don't over train. If you are missing a rep you are overtraining."
Interview With Powerlifter Shawn O'Halloran
Basically, you should be hittin all of your reps, and if you're not then simply lighten the weight. And just make sure to keep eating like a BEAST!