Backsquat + Romanian Deadlifts and Leg Auxiliary

Afternoon

Warm up
A.) Stretching and light squats

Work
A.) 3x15 Backsquat
B.) 4x10 DB Romania deadlift
C.) 3x10 Single leg extension
D.) 3x10 Hamstring curl

Results
A.) UB @ 185lbs
B.) UB @ 100lbs/hand
C.) 40lbs
D.) 90lbs

Notes:
Not sure what the hell the deal is with my lower back these days, but its really starting to piss me off. A lot. Felt tightness to an annoying degree in my low back and the front of my right quad. Not sure what the deal is, but I'm really reading for this to be over.