Fat Loss Rate & the Scale

aberc

I've been doing pretty well on my eating habits, exercise routine, etc.. I hit a plateau a long time ago at about 140 lbs, then started to increase my calories after figuring out I wasn't eating enough, got down to about 130 lbs. I then started lifting which dropped me down to about 125 lbs. When I started lifting, I started to take measurements, too.

My first measurements were around May. I only took waist and hip measurements until recently, so that's all I've got to go on
First measurements were: Waist was around 30.4, hips around 34.6
Today: Waist is about 29.4, hips around 33.3

So a good inch has been lost in my midsection over the past few months, but my scale has not budged.
This isn't a problem to me, but I know you can't gain muscle on a deficit, so should the scale start to move since I've probably already got my "newbie" gains?

Also, I know a healthy, good-paced rate of weight loss is about 0.5-1.5 lbs per week, but what is a good rate of fat loss?
Like how fast should my measurements be going down?

( TDEE is around 1900, I eat around 1500-1600 calories. 5'4" female, 125 lbs.. )