I’ve done a lot of that manually using key frames. However, Crumple Pop makes a plugin that makes it easy to do. https://www.crumplepop.com/product/fcpx-motion-tracking-plugin-easytracker/

I’ve used it for years and like it.
Easy to use. Great results.
You can get good keys quickly. You can also dig deep and fine tune keys with countless individual settings.
Since the video is shot in my green screen studio and the lighting is the same for each shoot, once I get a really good key, I can usually cut and paste the attributes and the…

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Start with your footage and the background image that is going to be keyed at 100%.

When you change the scale and/or position of the footage, you need to also change the sale and/or position of your background image.

By doing this, you will not see any shrinking or enlarging.

David

The Custom Title in FCPX allows you to change any of it’s parameters. So you could use that. Larry Jordan has a short tutorial on it in his Inside Tips:

https://www.theinsidetips.com/tip-888-secrets-of-the-custom-title/

If you want to use Photoshop. Create them oversized so you can enlarge them without out losing quality. If you’re editing…

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Sounds strange. I just dropped the “Basic Lower Third” title into the timeline and there was no fade on it.

I usually use the CUSTOM title for all my on screen text.
In the Properties you can control just about anything you can imagine. There is a good tutorial someone created on using this. Maybe google it in YouTube.

Try taking all your title…

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I imagine you made sure that the Dissolve In for each title is the SAME duration