#1 NA 1h'er Cav here...
Its not a bump stab, its a stab bump. Your stab hits BEFORE the person is bumped. If you sat there and downblocked you would only take charge dmg from the horse or you could just jump away while downblocking just like lances.
Its quite balanced, because if you miss your stab (which isnt that hard) you are completely defenseless. I have died countless times missing my target.
This stab attack is an actual equalizer for 1h cav. It is the only attack I use against an aware and READY victim, and it is also a target of last resort...due to how risky it is, you are much better finding another target or someone to bump for teammates.
Lancers get couching, 1h get frontal stabs.
Dont change a thing.