1.) Ask someone else if they can detect your frag, at what distance, and if they can when you walk by. You may have olfactory fatigue.
2.) Apply to areas that have the lowest percentage of body fat; where vessels/veins/arteries are close to the surface. The theory being that good projection takes some heat to evaporate the fragrance molecules.
3.) To help with #2, you can use a non-contact (infrared) thermometer (my carotid area is 93.6 at the moment).
4.) Try using fragrances with a higher alcohol content (generally, they should project more, but last less).
5.) Apply to clean skin, free of moisturizing products or anything else.
6.) Try applying to clothing (but not on any synthetic material like polyester since it can hold onto scents and will never give it up). I'd be cautious about wool too. On that note, I don't recommend any fabric softeners or any scented clothing detergent.
7.) Don't spray and walk through. Try slowly squeezing the nozzle to express the fragrance out onto a wrist. Bring the (still wet) wrist together with the opposite, then touch both wrists to the carotid areas (sides of neck). Experiment.