You have probably heard this before but a wick can make all the difference in scent throw. I tested with 2 LX-20's and the throw was really strong but I wasn't completely happy with the burn so I'm testing with 2 HTP 83's ( same wax, same jar, same fo and amount ) Okay, the burn is very similar ( as far as melt pool width and depth ) but now instead of the throw being all through the house it's only strong in the one room. If you know your oil is good and strong and should be throwing then try a different wick. Some wicks just work better with different wax/fo combos.