My GIFs are too fast -- cannot change speed

Hi, folks! This is my first time posting, but I've spent a while searching the internet for solutions to this problem and have yet to find anything. Here goes:

I've been making GIFs in Photoshop using these steps:

1. import video using the "video frames to layers" option
2. make changes to color, add text, etc.
3. click "convert to video timeline."
4. in the "layers" tab, select all layers, then click "convert to smart object."
5. apply smart sharpen
6. export using "save for web (legacy)"

The problem is that these gifs are far too fast. However, using the "Set Timeline Framerate" option does not solve this. The default is 30 fps. I would assume that if I changed this to 24 fps, fewer frames would be played per second, and thus the gif itself would be longer in duration. This is not the case; the gif remains the same length, with frames having been removed. 

I know that I can set the frame delay before I convert to a video timeline, and while this does have an effect on the end result, unfortunately the options there are not precise enough. .04 seconds is too fast, and .05 seconds is too slow, once the project has been converted (exporting the gif WITHOUT having changed it to a video timeline and smart object is fine; .04 is a great delay in that case. However, that speed is altered when I convert, and I need to convert in order to use smart sharpen efficiently. I don't fancy applying it manually to 197 frames/layers in a row).

This is a LOT of information, but I am hoping to be concise and thorough! I have seen a number of people with this "issue," and a lot of replies that boil down to "that's not what should be happening, so it must not be." Sad to say, it is. Any thoughts?