Welcome to 'Everyone gives you settings to play with." :)
If the problem is happening at the highest point of the model, and especially if it only happens with this model (or similar models that come to a point), it may be that the highest layers of the model are printing too quickly -- that there's not enough time for the material to cool before new material gets laid down on top of it, and the peak collapses into a disc as a result. To see if this is it, try changing the "Minimum Layer Time" from the default 5 seconds to 30. (If this turns out to be the issue, a setting of 15 or even 10 may well be fine and will speed up the print.) Also turn on the "Lift Head" setting so that the warm nozzle isn't parked directly on top of the fragile area of the print during the waiting time.
Can you show what the top of the model is supposed to look like? Is that supposed to be a chimney?
Also, unrelated, it's good to slow down printing speed but keep travel fast. 150mm/sec minimum.
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