the Starr 5x5 had no deadlifts, and considering Weds. is light day, i don't see any reason not to replace them with powercleans. i love deadlifts but after 4 or 5 weeks of pr's on every lift they get very taxing!
adding the push press to the clean is a great idea.
i swapped deadlift to powercleans on my second 5x5, mostly because i like doing them but around week 7/8 the deads were starting to wipe me out too much for friday's squats
maybe you need to use a more advanced routine, with the big weights your moving weekly progression maybe too much. but you didn't give any training history so it's hard to say especially as your form is good. how about mixing in more strongman lifts or concetrate on deads if they dont hurt the...
the reason that the beginner 3x5 is better is that you will progress much faster than intermidiate . 3x5 = progress every workout
5x5 = progress every week
when you fail to add weight every workout after several resets then you go to the weekly progression.
the main thing is to do multi joint exercises such as squats, deadlift, barbell rows, standing barbell press, bench press, 3x a week , do 3 sets x 5-8 reps and add some weight (1-2kg) to each exercise every workout. eg:day 1 squat 3x5...
all of it. in SS it says to hold the bar on the front delts with elbows forward and up, like a front squat but with the bar in the palm, then at lock out your head moves under the bar. so you don't get any bounce at the bottom.. it's a dead start.
cheers