I was trying to think of a solution to the 1 cub litter issue seeming so punishing despite stats staying the same since the site's launch. True RNG rarely feels fair to an end user, which is why many games have adopted a pseudo or weighted RNG that more closely matches human expectations.

To make a long story short, my suggestion is this:

Implement a streak mechanic that can either be per lion or per pride that makes 2 cub litters more likely to happen the more 1 cub litters you have in a row. The streak would be reset on 2+ cub litters. This increasing chance doesn't have to be anything major - it could start as something practically negligible (50% becomes 50.67% scaling by .67% each iteration) and start gauging the economical impact and player perception from there. The very idea that a "1 cub streak" increases chances, however small, of not being disappointed during the next breeding just might be enough to satisfy players.

I hope I explained this well enough, but please don't hesitate to ask me to clarify anything.