After my back tweaking 11 days ago I have not been under a heavy load since. It was a hell of a first day back loading my posterior chain that is for sure! This particular set I was actually scared of, I have not been in this position in - what seem's to be - a long time. The set prior to my 550 I took 510 and that set was rough, this is why I broke out the INHALE prior to the set.
Quad's are getting destroyed this training cycle, will be picking a meet here within the next few week's and my training will start transitioning into more hell, lol.