I use low mount position, currently using a Sonik Sk4 overhead rod with a Daiwa XSHA30, Best for me at the moment, Just seem comfortable with it. I use a rod bucket and a back brace. Brace helps when fighting a ray or shark. I have never had issues with low mount as this is how I was taught as a youngster.
Suggest trying both low and high mount seat and sticking with what works for you. Dark side the best side