Anyone switch from blue to purple and do better? I've been on blue since October (technically on Freestyle since it started but slacked off bad then rejoined in October) and have lost 25 pounds but it's slowing down and wondering if a plan switch would hurt me or give my weight loss a jolt. I was doing the equivalent to purple years and years ago and lost a ton of weight but I'm nervous after being so used to blue now. ThanksIA!