I'm using a halogen air fyer, the 30 quid one others are using from amazon with green mug wraps, temp 180 (i have a thermometer in there) for 9 minutes, I print the same design on each side of the mug (inkexperts ink + paper), once baked one side looks perfect, the other is very dull in comparison, any ideas ? test prints i did last week were great, i finally sell a mug and i have ruined three so far trying to make it, moral is low, any help gratefully received.