I roast my own with a heat gun. 5 mins or under and it’s scorched, 10 mins or over and it’s baked. I want in the middle. Too dark and oily and it’s not great.

I roast my own with a heat gun. 5 mins or under and it’s scorched, 10 mins or over and it’s baked. I want in the middle. Too dark and oily and it’s not great. Too light and I miss the bitterness and it tastes weak. I need to stir it a lot or the roast is uneven. I spray water on it at the end to arrest the roasting.