I've always used Keto with great results. One thing I have learned though, both from myself getting older, and working with clients of different ages, is that you'll need to mess around with your cycle duration. I've seen women stay out of ketosis for a week and a half, and I've personally gone into ketosis after only a day and a half. Find the cycle time that works best for you then stick with it. Rinse and repeat. Due to the nature of how this form of dieting works, you should be able to get nearly the same results week in and week out. Here's another couple of tips:
1) I KNOW you're using ketone test strips.....right? If they are old, toss em and get a new bottle.
2) unfortunately, the glycemic index doesn't seem to get along too well with carb depleting. If you are eating bars or shakes that say they have low NET carbs, but it's based on glycemic rating, then you are fucking yourself. Best to avoid bars and shakes altogether, except maybe isopure or another truly carb free shake.
3) Alpha Lipoic Acid. Go get some right now. Its friggin fantastic for you, but besides that, it will get you into ketosis MUCH quicker. 1000000 times safer than insulin. Some people swear by being able to use it to fight back against incidental carbs or moments of weakness during a ketosis cycle.
good luck with whatever you decide to do. diet is definitely the way to go for fat loss.