DK Men is a stronger, superior version of it that smells almost the same (but better) and shares that elusive suede note. it is, sadly, discontinued. you could try ebay - if you live in the US you can still find it at reasonable prices.
i generally wear dark blue in fall or winter, and when i spray it i spray it on myself inside a nice fluffy sweater... so the overspray gets on the sweater and it lasts a long time that way. my g/f absolutely loves this stuff, and because it is so similar to DK Men, which i wore when i was in college, it brings back all the scent-triggered memories
the longevity on dark blue isnt that great, but i definitely wouldnt call it 'bad'. its average, IMO. with 2 spritzes you get decent sillage - are you sure its not there, you may just have olfactory fatigue. ask someone else, preferably of the female variety