I use Ella Gay, she is excellent. She does both horse and rider- she helped me a lot after I broke my pelvis and rehabbed several broken horses back to work.
Have you tried single flap saddles? They can be as forward cut as you like without touching the horses shoulder or interfering with her. I am 5"9 and ride short on a big moving warmblood and have found the Mark Todd Charmisa works a treat.