I have a 94 second countdown, followed by an open. The idea is to have a video trigger that says "this many milliseconds delay after the transition in, hit record" so I don't have to remember, and so the recording skips the countdown and goes right into the intro.

But the trigger is firing WAY early. So, to test exactly how off we were, I set the delay to 100000ms, or 100 seconds. The trigger fired at 30 seconds in. Help?

Better way is to create a title input, you can pick for example "Add input - Title/XAML - Timer - TimerClock"
It will open window with txtClock field. Empty it.
Click on countdown Settings.
Set Duration to 00:01:34 (94 seconds), press OK. Check "Display *** when Stopped"
Click OK, close Title editor.

Now open this input's settings - Triggers, add trigger "OnCountdownCompleted" and select your desired function. In your case, it should be "StartRecording"

Now open trigger settings for the input, which should start the countdown/trigger timing. In your case open your video trigger settings and add OnTransitionIn - StartCountdown - select previously added countdown title - select title field where you configured countdown, in this case, txtClock.

Now, when your video is Transitioned In, it will start countdown on the title input, when it reaches 0, it will trigger recording.