With my experience with swords, platies and guppies, they have broods that can be from 2-50. I have seen the largest female sword looking like she was ready to explode drop only 4-5 babies and then one that looks very small but you can see the babies eyes in here tummy, drop 35. It could have to do with the ration of male to female. 3:1 will keep them happy but produce less babies if there is only one male. Has to spread himself too much to the others to produce large patches. 2 males to 5 females works well to produce large batches. Lets of plants will also help the babies to survive by providing lots of cover that the mother will give birth in and provide their first food source withut feeding them. I found 27 sword fry in a bunch of java moss that I didn't even know had been born.
IMO, I would be much happier with smaller batches. The female is much less stressed out and the babies always seem to be happier and healthier. I plan to start breeding BN plecos and will probably go 1 male to 2 females just to get multiple broods but hopefully smaller than 100 at a time they have been known to have.