Love Rocket was always this ridiculous drop rate. I can't think of a stealth nerf they've done to any mount drop off the top of my head, either. Most have been buffed.
Oh and while it is the same each time you don't seem to understand statistics.
100000 people do 50 runs a day and 100000 people do 1 run a day. Which group will see more mounts? You are improving your chances regardless of the fact it's still 'the same chance each time'. Is bonus loot a complete waste to you?