15 pounds in three months shouldn't be disappointing. At that rate you'll lose 60 pounds per year. How long did it take to gain 15 pounds? I'll bet a lot more than 3 months.
What you are doing is working. Just keep doing it.
I successfully did rapid weight loss to meet fighting weights. It's not a permanent plan. What you are doing is a permanent plan. Stick to it.
And congratulations.
Also, you may have gained muscle weight in your legs, etc. Compare your current bodyfat to your previous bodyfat %.