FP, I'm late to the party, but... I think it was OK fit for the horse, but not for you. (and yeah, I don't like Bates much either). For your size I'd say 17 should be OK. I'm WAY taller than you (5'8"+) and I have 18 for my CC (could of go with 17.5 even per my saddle fitter).
I'd suggest to look into Thornhill may be. It was a good fit for my mare (although I ended up with wide MT something). BTW, even with MT it'll depend on model a lot: I tried 3 and only one was a good fit (can't think of name right now, but not one from Dover, I think Claudine or something).
"Life isn't about waiting for the storm to pass: it's about learning to dance in the rain..."
"When we are no longer able to change a situation - we are challenged to change ourselves."
"How people treat you is their karma; how you react is yours."