Hi!
I'm 5'4", 164. Personally, I'm quite happy here from a health standpoint, but am dieting further for vanity purposes. But it completely depends on what YOUR body does. All along this journey I seem to carry my weight well. At this weight, I fit in an 8/10. I got down to 145 and was a 4/6. I had trouble maintaining that. I felt like 4/6 was not just healthy, but THIN, and it was at the very top of my "healthy weight range".
Others still think 145 is too much, and honestly, are probably right. It depends on the individual and what your body does with the weight. I swear I pack on muscle really well.
My biggest regret in this journey has been that I randomly chose 135 from the start. When I didn't make it, I felt like I had failed. Yes, I got down to a size 4/6, and had failed???? What??? So now my goal is 145, and if I get there, I'm going to celebrate this time! Therefore, I suggest getting to 160, celebrating, and taking it from there.