I tried this game many times already but never won more than 100x, I could not even collect more than 10wilds so far.
The problem with bronco is the $0.25 minimum bet, so you probably tried not as many as you do with $0.1 slots. Moreover, we had a great payout in August/September so probably it is in the "cold" state right now.
I do not think it is about the minimum bet, I can play this game as low as Rp.1000 or even Rp. 200 on fiat local casino as you can see
https://prntscr.com/uxljpdI made thousands bet in this game since the beginning of this month but still no luck to collect more than 10 wilds or more than 100x po.
That's why I say this type of game is not my game as I get better luck on Megaways type and/or Puzzle type.