Can't help on the number of meals as I did 2 right from the get go, with a treat -dried liver, greenie, or chicken jerky at lunch time.
I started out feeding about what you are 3/4 cup in the morning and 1/2 at supper time. No wet food though. I only do kibble and I don't wet it either. Hanna has gorgeous white teeth - not a hint of tartar at 14 months and nice breath.
Like Shelli, I don't put any faith in the package recommendations. With a good quality food they don't need a lot of kibble. Another sign of too much food is if the stool is not nice and firm and easy to pick up. Left over food at meal times is another indication. If they are too fat, then you need to feed less, gradually cut down until you start to see a loss. The exception being if they have a thyroid problem, in which case you need the pills along with a diet to get them back in weight.
I can't recall at what stage I cut back, but we went to 1/2 cup twice a day and then down to 1/3 cup twice day. She was still looking pretty broad in the rear end so I switched her to lower calorie/cup Fromm Adult from Blue Buffalo puppy food at about 8 months but kept it at the 1/3 cup twice a day. She maintained on that but did not lose and so I cut it back to 1/4 cup twice a day, and restricted treats to just one a day no dried sweet potato. That did the trick, in a couple of months she got back to what I think is a really good weight for her 16 pounds at 14.25 inches tall and about 16" long. So she is a little bigger than Ember but getting the same amount of food. We don't do agility, so I would put her activity level at low - one daily 3 km walk ( less if it's freezing) and I throw the ball for her until she won't run anymore once a day.
My last suggestion is to premeasure the food - with my low thyroid Kali I actually weighed a whole weeks' worth in portions down to the single kibble, and prepackaged treats too.
As you can see from the photos, under that coat she isn't very wide at all. There's a definite waist and she doesn't feel heavy when I pick her up. She also has more energy, so this is where I plan to keep her. She doesn't inhale her food but it takes her only a couple of minutes to finish it off.