Try putting HTC Calendar on so it's touching bottom row. At least that one gave me a sense fc boot loop. Had to flash normal rosie and then back to 4x5.I've got "Smooth Calendar" in bottom row of home page and "GO SMS Widget" (4x2) in bottom of another page => no FC at all with these two Widgets.
But I have to press screen lightly above target to act with them (another user has said the same thing some pages ago if I remember well).