I’m not as tall as you but my hip to knee measurement is just a little longer. Finding a dressage saddle was torture. (My main (saddle) squeeze is an 18" CWD SE08 with extra long flaps that I ended up having made for my horse and I.)
some things that might help: look for extra long flaps, a slightly forward flap, pay attention to the stirrup bar (preference varies among riders so even in saddles that don’t fit you perfectly see where that is located in proximity to your hip to find your preference- I tend to like it a little longer/further back because my femur is so long it comes forward all on its own).
Super rigid thigh blocks are an issue for me in saddles I ride in that aren’t mine because my leg ends up needing to come forward a litttle but the thigh block inhibits it. Constricting saddle types (super deep seat, prominent thigh block) are hard for me because I’m fighting the saddle to get in correct position. Rigid super straight flaps also can give me this issue, as well as long thigh blocks.
I had a jane Savoie schleese saddle and hated it. I was fighting the thigh block the whole time. Prestige has some models I’ve liked. Keiffer and Barnsby tend to be less extreme (smaller thigh block for example) and I was able to make an imperfect fit work for me easier than some other brands, if you can find any on the market. Amerigo/Vega saddles are really challenging for me if the fit isn’t good - my trainer has an Amerigo that’s a 17.5? with a very straight flap and it does not work for me at all - and it locks me in position so modifying to make it work is really hard.
I’ve had good luck with Fine Used Saddles. You can contact them with your specific situation and they may be able to come up with some good options for you, even if they aren’t in stock at the moment.
Saddle searching can be a pain. Good luck!