Meditation Question

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I started doing TM about seven years ago. While meditating, I experienced what the TMer's call "witnessing," which ACT calls the observing self. I did a little research and that's how I found ACT. After reading GOYMAIYL, I started doing the leaves on a stream meditation. I didn't want to stop the TM so I looked around for advice. It seemed like everyone picked a side, mindfulness or mantra meditation. The only person who seemed unbiased was Deepak Chopra so I sent him an email. He wrote back the next day, surprisingly, and advised me to do the tm in the morning, wait five minutes, then do the mindfulness. Then TM again in the evening. So that's what I've been doing for the last 3 or 4 years. I'd like to pare down this meditation schedule a bit but I hesitate dropping the TM because some studies show evidence of mantra meditation adding a few years to your life. But the last study I read found that most meditation studies were poorly done and often biased so I don't know. I read somewhere that there are two ways to extend your life; calorie restriction and dropping your core temperature. Supposedly TM reduces your core temperature. Whenever I take my temperature these days it's about 97.4 so maybe there's something to that. I don't know. Anyone have any advice?