Hello – having similar issue – wpautop is adding <p> and <br /> tags to my sf_product_description and sf_product_short_description fields.
I tried adding this code to the functions.php and it still doesn’t work.
remove_filter( 'sf_product_description', 'wpautop' );
remove_filter( 'sf_product_short_description', 'wpautop' );
Is there a different ID for those fields or another way to code this?