I used about 600 of those tapcons to secure my walls and subfloor to
the concrete.

About 1 in 10 snapped below the torque required to drive them in.

This probably had more to do with the hardness of the concrete than
the bolt.

If your block is softer than mortar, you have bigger issues.

Why not run a few 2X4's floor to ceiling to temporarily secure your
electrics to.