I found a solution for my pages: give the parent element a width and height! The font will not go outside those borders, and so it will remain small(er).
After some tests this rule helped me out. Must be added either to the element containing boosted text or it's parent depending on the div/table structure.
element or parent element {
/* prevent font boosting on mobile devices */
width: 100%;
height: auto;
min-height: 1px;
max-height: 999999px;
}
Maybe the width and heigth values must be corrected according your needs.