I want to export with alpha channel using a codec that carries less data than gopro cineform

Hi--I want to export some intermediate files with an alpha channel. i'm using gopro cineform, and these files end up being so large, meaning that i have to sit through hour long renders.  is there a a codec i can use that has an alpha chanel but creates a smaller file size?
thanks

Thanks for your help Patrick. I tell ya, I can't believe what's going on. As I said, this project until today has not caused me any issues what-so-ever. The other six sessions are totally fine. I also created a quick project with the same settings added text - then exported using the same settings I've used before, and it exports with the proper alpha channel.
Yet, I rebooted the Mac, made sure to delete old versions in the trash can and everything. Still, no alpha.
To keep moving forward, I literally had to use a color key in FCP to cut out the background color.
Crazy!

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