Okay! Sorry for the late response. Two things should fix this (one was my mistake!)
For the timeline you want it going from 0 to 1, and you have it going from 1 to 0. 
Though I suppose you could just switch the A and B on the LERP but that’s… strange programming philosophy.
Secondly, this is your current yaw. This should be “A” on your LERP.
For B, you want to ADD that number and your random float together. Take that output and set as “Rotate Yaw” before the timeline. You want your B to be the rotation you’re wanting to achieve, not how much + or -. 