It's been a hot minute since I've run this game but for Comstock Gate Skip I remember it being important that you approach the gate from the right instead of the left when doing the first death.

There is a big statue in the center of the area so if you watch runners they tend to go a roundabout way to the gate and approach from the right side. Check a couple old runs to see what I mean. Once you get revived you need to run and jump onto the railing immediately so your grounded state is still marked as being on the other side of the gate. Then you just make your way along the railings until you get to the spot you need to jump off of.