Hello and welcome

In the end you have to be your own teacher. If you believe your meditation is disrupting your training and not enhancing it, that is something that you may need to think about. I don't think it's a bad thing you can zone out and flow in training. In fact that's the prize a lot of martial arts are after in training.

Also, if you are in the "mind of no mind" how are you aware that your skill isn't moving on?
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"Let your food be your medicine, and your medicine be your food" Hippocrates.