I think some will strike at that temp but you need a longer hold time, like 3 to 4 hours. The ga site has this info. You need to make sure the haze is completely burned off also.
Not a jelly but shows haze and no haze
The purple has no haze and the blue is haze. Kilned at 1075 for 3 hours with a small amount of flame strike. Done on a cricket with 2 oxy cons.