Balance is always a concern and I try to make small adjustments if there are issues. For the latest update I heard Neko was too tough, but you're saying all predators? With Vigor and Technique maxed, the success rate in the game ranges from 90% to at worst 75%. Pure RNG probably isn't great, but to get 4 successful attempts out of 8 with those odds shouldn't be too difficult. Sometimes you get a -1 to progress, but that should be rare, unless something else is happening that I'm not aware of.
If you have a specific suggestion as to how it could be easier I can consider it.
A reminder that you can take advantage of Simple Load if you do want to keep your progress while doing this instead of totally starting over. Simple Load will put Amelia outside on the space containing her diary.