Fevipiprant is more potent than seti, but it's never been tested as a hair loss treatment. It is being tested as an asthma treatment, but the results have been disappointing, and it looks like it won't make it to market. It gets talked about as an alternative to setipiprant because it's more potent and could be obtained off label for hair loss if the asthma drug were to make it to market. TM30089 is the most potent PGD2 inhibitor. It's only available as a research compound, and not many people have tested it. Ramatroban is in the middle. Much more potent than the others, but not as potent as TM which virtually eliminates PGD2.
It is readily available on Alibaba, but it is expensive. I would be concerned if you have ever had cancer, or even if you have a family history of cancer. I used it for a few months before, and I definitely think it helped, but I was not comfortable using it long-term. It shouldn't be an issue though unless you already have cancer. If you want a safer minoxidil alternative I suggest adenosine or bimatoprost.