You can train your inner ear to become more tollerant of spins. I'm 35 years old doing full front tucks and working on a cork screw without getting dizzy. Yes, when I first started I got dizzy, but I pushed my self to the limit regularly and my limit has grown greatly.
As for how not to spin goes it all comes down to leg, back, and core strength. For every muscle that moves a joint in one direction, another muscle moves it in the other direction. The opposite direction may need work. As far as technique goes, I think a video would be needed before any critique can be given. Sometimes extremely small adjustments can make all the difference in the world. Also out of these people who claim that every kick needs to be thrown at 100%, how many of them have shattered their foot when hitting a knee cap? Or if you think all your kicks should be thrown making contact with the ball of your foot how many toes have you broken?
I have TKD training and no I have not trained in MT. Every round kick, side kick, and hook kick I have thrown required the base foots toes to be pointing between 135 and 180 degrees from the target. Depending on the situation I may plant my base foot at some angle before starting to throw the kick or pivot on the ball of the foot from a more neutral position as I throw the kick. The big thing is how much warning do I want to give my opponent? Also for how long can I risk keeping my base leg knee vulnerable to a push kick?
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