remixer

HI, I'm a newbie, and i've had some success using the methods i was told but in other cases i've had problems i was told .. Heat wax to about 180 (using Cb Avanced) let cool to 170 Add FO at 170 stir then pour into container. My containers look wonderful with no spots/frosting However some of my fragrances don't always work for instance last night i had a sample of a Coffee FO .. when i added it to the wax and poured my garage (where i work) smelled GREAT for 3 or 4 hours after and i was really looking forward to burning the candle.. however this morning when i smelled the candle dry (unlit) it barely smelled of anything .. then lit the same thing very poor. so my thought is maybe i burned off all the FO last night.. so am i adding the FO at too high a temp .. should i try it lower .. What temps do you guys add FO to CB advanced at ?? Thanks in advance !