we got back in the small hours of yesterday and Dalaman is red hot on charging for overweight luggage - we've never known it before
one guy was charged for being 2kg over!!!
the rate they charge seems to depend on which airline you fly with - Onur are charging £2 per kilo over, not sure on the rates with other airlines
I'd suggest cramming as much as you can into your hand luggage as they don't always charge for or weigh that
good luck