Thanks for the compliment.
Well, there really isn’t any difference between collisions in the atmosphere and in the counter-rotating beams in a physical sense, since they are both occuring in a rareified near-vacuum environment. The moon surface might have slightly different types of collisions more often, since you could have interaction with the surface as a solid, but would still have all of the types that would happen in the collider, just very slightly less frequently.
If a cosmic ray hits the surface of the moon and produces a black hole, the black hole will have to travel through the moon interacting with all that mass as it goes. That means a very large number of collisions, each one of which will reduce its velocity, so, yeah, we should expect the moon situation to basically be identical with the counter-rotating beams.
As far as the black holes sticking around, they’d have considerably less velocity than the original particles in the collision, but they’d still be traveling near the speed of light. The counter-rotating beams are not well matched in velocity. Remember, that in relativity, very close to the speed of light with extremely small variation minus very close to the speed of light with extremely small variation equals almost everything from 0 to fairly close to the speed of light.
Also, if black holes are created by cosmic ray collisions and don’t evaporate, then the universe should be swarming with mini black holes. Since we don’t see this, we’re safe.