Custom Hands aren't as smooth as other games and main Oculus environment

Are you testing in editor? Theres quite a bit of additional overhead there that can cause this

I'm using Oculus Quest, so this is happening on all of the builds I've made so far.

I haven't noticed that the Hands in my Example project are any more/less jittery/shaky than other games.  I had a problem with held objects, but was able to fix it in my latest build.  If I wave my hands around quickly, I see some jumping as if vsync is causing some visualization artifacts.  But I see the same thing in Vader Immortal.  I think it just seems more pronounced in my project because of the color scheme and lighting.

It's hard to explain, but it's like the hands are a frame behind if moving fast. They track really well, but the 3D objects look a little laggy when translating.

If the custom hands are getting their position updated in FixedUpdate then they will be a about a frame behind the actual position of your hands.

Also, if the frame rate on Oculus Quest is low the place that will be most noticeable is your hand movement. Put in a frame rate counter and make sure the app is actually running at 72 fps on the Quest.

It's running at about 58-60FPS

You may have to adjust your timings.

Something like this:

switch (OVRPlugin.GetSystemHeadsetType())
            {
                case OVRPlugin.SystemHeadset.Oculus_Go:
                case OVRPlugin.SystemHeadset.Oculus_Quest:
                    Time.fixedDeltaTime = 0.0138f;
                    break;
                case OVRPlugin.SystemHeadset.Rift_S:
                    Time.fixedDeltaTime = 0.0125f;
                    break;
                case OVRPlugin.SystemHeadset.Rift_CB:
                case OVRPlugin.SystemHeadset.Rift_CV1:
                case OVRPlugin.SystemHeadset.Rift_DK1:
                case OVRPlugin.SystemHeadset.Rift_DK2:
                    Time.fixedDeltaTime = 0.0111f;
                    break;
                case OVRPlugin.SystemHeadset.GearVR_R320:
                case OVRPlugin.SystemHeadset.GearVR_R321:
                case OVRPlugin.SystemHeadset.GearVR_R322:
                case OVRPlugin.SystemHeadset.GearVR_R323:
                case OVRPlugin.SystemHeadset.GearVR_R324:
                case OVRPlugin.SystemHeadset.GearVR_R325:
                    Time.fixedDeltaTime = 0.0167f;
                    break;
            }

I'm still seeing the same hand lag. My scene has a lot of assets, but on the Custom Hands scene I still see the hand lag even with 70fps. Another note is that my graphic settings and player settings are all at the Oculus recommended values. I recorded a video snippet, but in the video the hand lag isn't visible like it is in real time with HMD itself. It's more noticeable when the hands are moving fast, but even at a slow pace it's visible.

Not sure if this could be Android Manifest related somehow? This is also a side-loaded app while in development if that makes any difference.

I have the same experience with my recordings.  They look fine.

Partial Solution:
I tried parenting the custom hands to the anchors of the CameraRig (instead of using the scripts) and that resolved the hand lag for me in the custom hands scene (running at 70FPS).

However, in my asset heavy scene (50-60FPS) there was still hand lag. So I started to whittle away at the assets to see if any particular one caused some sort of render slow down. I removed everything, but 1 of the main interactive objects and the slowdown occurred ONLY when it was in view, otherwise the hands ran smooth. On the MeshRenderer, I disabled the probes (light/reflection), and this resolved the hand lag completely.

Update 10-25-19:
 I received messages about this and wanted to share another update. I don't think the blend probes was completely accurate since adding in more assets I faced the hand lag problem again. 

Real-time Lighting:
I found that real-time light sources could be a problem, so turning these off fixed the problem in scenes with not as many assets. However, this is not ideal for asset-heavy scenes where the lighting needs to be more dynamic, like turning on a light switch. Below are some more things I've tested.

Other Tests:
1. When monoscopic mode is set for the OVR Manager the problem goes away without turning off the the real time lights. (This option isn't ideal though since the camera drastically changes)

2. Oculus recommends Forward Rendering Path, but selecting "Legacy Vertex Lit" also got rid of the hand lag without turning off the real-time lights. Also, not super ideal.

3. I'm using Unity 2019.2.8f1, but I also tried the Oculus recommended Unity versions which did not fix the problem.