Blizz made it harder to get the horseman mount

[Cowvenent-area-52]

@Maizou-proudmoore

Now:

First attempt of the account each day: 0.3% chance.
Subsequent attempts each day: 0.1% chance.
First attempt of the account each day with curses: 0.3% chance, with an additional 0.1% chance per curse active, for a total of 0.7%.
Subsequent attempts each day with curses: 0.1% chance with an additional 0.1% per curse, for a max of 0.4%.

emphasis mine

Are we sure that subsequent attempts on hard mode give a greater chance?

Here is the blue post:

Headless Horseman and the Hallow's End event

Yes, and the first drop of the day receives a bonus likelihood that scales with the number of curses you apply.

Which mentions ONLY the first drop of the day.