Ok i will try that, have you cleaned your tubes? If so what did you use?
When you do, since you have tightened down the latch, back it off, then go easy. It may take a bit longer initially, but 1/16 of an inch on the hinges will make a considerable difference in how tight the door is. Take a turn on each hinge, then try closing the door; you want it to take a bit, but not a lot, of pressure to close it. After you have the hinges about right then you can fine tune the fit with the latch.
I have a number of different boilers in different investment properties so I keep an assortment of boiler cleaning brushes of different sizes and stiffness. I just use a medium stiffness brush that fits the tubes.