My very hot, sensitive and occasionally explosive TB cannot wear a bit due to a mouth issue and I very successfully ride her in a Zilco Flower Hackamore. She goes better in it than she ever did in any bit.
https://www.thehorseshoof.com/bitless_zilco.html
Before I found the flower hack I tried a mechanical/english hackamore, which was linked above but it gave me ZERO brakes and mediocre steering. I tried an S-hack which infuriated her to the point that she started popping up on me at a walk. Just the pressure it exerted and the inflexible nose rope was way too much for her. I also tried a rope halter - big fail. I tried a side pull - again, no brakes. I tried a slightly different model hackamore that a western friend uses and that infuriated my horse as well. The second I put the Flower hack on my horse was happy as a clam!!
It comes with a flat curb strap which is worthless. I immediately swapped it for a regular curb chain. The genius part of the flower is you have multiple positions you can use depending on the severity and amount of pressure you want exerted. The height of the hack on the horse’s nose also makes a difference - when I have the hack up even 2 more holes, I suddenly have an irritable horse again. So that is really, really important when fitting any hackamore. Interestingly enough, I was able to use the flower hack on its normal settings as it is demonstrated on the website:
https://www.thehorseshoof.com/ZilcoFitting.pdf
Because of the design you can attach the bridle to different “petals” if you will which is awesome and what sets this apart from other hacks. I expected to have to set it pretty strongly but nope! Pretty great! I highly recommend it. My horse steers great in it - we have jumped in it and now do dressage with stellar results. Took a few rides to get it dialed in and then we were good to go.