I am currently about 10 lbs away from the top of the official goal range, and I am still eating ALL points. All Weeklies, all Activities. I calculate APs using a heart rate monitor (80 cals per AP). I hit 26 Daily points at approx 180 lbs and I'm now almost 150, still losing on that (and weekly and activity).
If you are mixing things up, eating more one week and less the next, it could simply come down to the weight of extra food in your belly on the weeks you eat a bit more. I like to choose one way of eating and do it for a few weeks. When I first started eating activity points (a few months into WW this time) I first decided on 2 weeks, then realized I would be hitting TOM and that might throw things off, and ultimately did a month of eating it all before making a decision. I decided up front to not let ANY higher reading on the scale, until the very end, mess up my plans. And it worked. TOM I went higher but then by the end of the 4 weeks I was definitely lower. And so I continued.
I see people in my meetings flip flop from one week to the next, and the thing is, fat isn't lost or gained that quickly. It takes time to make fat, it takes time to get rid of fat. Most of what we're doing when we flip flop from week to week is change our hydration levels and the amount of food in our bellies.
I have an Exercise Science degree, and when I was in college we were taught that "starvation" mode was truth. They had done studies, they felt it was true. Nowadays they say it's a myth. Wonder what will happen in 5 or 10 more years.
What I know is that when I do "deprivation mode", when I don't fuel my workouts, I get HUNGRY. When I get hungry, I get full of cravings. When I'm depriving myself of what I want and crave, things get ugly. So starvation mode, hibernation mode, or not, it has very bad results for me. Mentally and physically I cannot handle it. (I love free fruit and veggies...LOVE it, it works so well for me!)
Either I binge and then go off the plan entirely (that's why this is my 4th proper time through, because I did deprivation mode the previous 3 times and for me that's not sustainable), OR I get too hungry which results in me fainting in the shower like I did in early April.
When I started eating my Weeklies early on this time, I felt a million times better, a zillion times happier. And I still lost.
When I started fueling my workouts, especially once I started running, my workouts got better. And I still lost. Using the most basic, rough WW math, a pointplus is approx 40 calories when you're eating the point. To earn an activity point, however, I need to burn 80. So even if I eat all APs, I'm still at a deficit.
So I say, make a choice and do it. Pick a period of time and a number of points or percentage of points, and do it. See what happens at the end. See how you feel.
And, of course you KNOW this, but since you're already in your goal range, you know that this is going to take some time. You're going to have to be patient. You'll also want to remember that when you start a new exercise, or do more of the old, you're going to have some hydration issues at first, where often our bodies hold on to water for a week or two... So you might see an upswing at first, but just stay the course, keep doing what you feel is right, and see how you do at the end of the period of time. If it doesn't work over 2, 3, 4 weeks, you know exactly what to do. If you've gained, you know what you did, and you know to just decrease. If you've maintained, either keep going (maybe it's a plateau) or change it up. You know this is going to take some time, so just keep on doing the program.
Best of luck!