Dry paper is an extreme test of bullet integrity, and most bullets will come apart in that medium. Wet books are a much better test, but even that is not correlative to many of the shots you take at deer....
How is a solid stack of soaking wet paper going to simulate a lung shot where 90% of what the bullet passes through are air-filled sacks? The paper may better simulate muscle tissue, but where do you shoot a deer requiring the bullet to penetrate 14+" of solid muscle? Expansion testing is an interesting and fun passtime, but what you think you learn from it is flawed. Even ballistic gelatin does not simulate lung tissue or bones, but it is the standard for this type of study in the forensic field.
Bottom line, brinnel 11 is okay for your bullets; the antimony has made them brittle but that's okay. Drill the hollowpoint deep enough that it can be counted on to blow off causing major tissue damage, leaving the remainder of the bullet for penetration. This is not unlike a Nosler Partition bullet's performance, and they have a pretty good reputation. I've used wheelweight bullets I hollowpoint myself for years and the performance is very good - but all bullets like this I've used were .451" and larger.