I practiced some launches on a certified local drag strip (County Road 800S to be precise

Note that I have 235s and a 2wd.
I currently have several hundred pounds of concrete hog slats (400-500 lbs if I were to guess). Are these giving me traction or weighing me down?
I was shifting on the column and I felt like I had a decent launch today. I didn't feed it too much boost and didn't spin the tires very much. I did have some junk slide off the dash on me

What do those with drag racing experience think about this?