I just got mine out of the oven but I made the mistake of putting the temperature too high, but if you can manage to leave it at 140 degrees you’re in for a treat.
Just out of curiosity, how high was your “too high” temperature? Especially with an oven thermometer, one can adjust the oven temperature to almost any setting, but 140° C is equivalent to an “in-between” temperature on ovens with dials marked in degrees Fahrenheit, usually in 25° increments, and I’m wondering whether it would be a better idea to shoot for 275° or 300°…
250 g of almonds to 70 g of flour+starch is “not enough”? I guess if you prefer a really strong flavor, a little extract couldn’t hurt, but I (myself) would try it as is first…