Well I figured it out finally... to a degree at least. Coolreader still gives me that weird text coding(I've never converted them. The formats are what I originally downloaded) and iReader crashes as soon as I open a book but moon+ reader is working just fine. Turns out that the books were being stored in a different location. On my old phone they were in the folder SDcard-> Downloads but now they're someplace else. There is still the same folder called SDcard and it has many things in it(mostly recent downloads). But now there is also a second folder called extSDcard which is located nowhere near the "normal" SDcard folder. I found it pretty much by accident while looking for something else. The confusing part though(other than why there are now 2 SD card directories) is when I go into the storage settings and open the SD card, the directory with all of my stuff in it is still labeled as SDcard. If it was labeled as extSDcard I could have figured this out a while ago lol
anyway, thanks for all of the help!