mmm well the sharpest knife i have is a bark river northstart. Not a pocket knife but its the sharpest i have on account for the convex edge and a2 steel with excellent heat treat. I have some slip joints that are sharp and can shave hair..just some old carbon steel blades not sure of the brand name but they sharpen and stay sharp for awhile. The reason the pocket knives are inherently sharp is because of the thin blades. Less drag equalls increase slicing effiecency.
You states that your knives can split hair but go dull quickly. Well that can be that you haven't removed all of the wire burr off the tip and when it is used the edge folds over and makes the knife dull...or if you are litterally "splitting hairs" chances are that you have achieved a sharper knife than i have ever seen and that edge will not last long at that state as it is fragile and wears very quickly. I have mades a knife shave a hair..little curls formed on the hair but this is a short lived thing and any knife with that kind of cutting power should shave hair and wood for a while but will not split hair for very long. You might be asking to much from the steel to preform at that level. But if all your burrs are removed and the knife stays sharp for quite a will with minor use i would say you "have one of the shapest pocket knives". Hope this helps. YOu could also try stroping on a smooth pants belt to bring that edge back as well.
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I'm a smart guy just don't ask me to spell or do complex math.-Deerinator