This has been the subject of debate in more than a few threads. It has been proven that you will gain less skill ups versus light blue mobs than dark blue (these mobs used to be green earlier in EQ History, green xp, remember?) and you will not gain anything from fighting greens. Since this is true, does this mean that skill ups increase if you go to fight a white, yellow, or even red mob? I personally don't think so. I, and many other posters from different mb's, have seen that it does not increase. Besides, who wants to be counter-productive? Going after higher level mobs will mean more hurt and pain, which means more med and heals are needed, which is downtime you could be using to kill more blues and get more skill ups.
If you really want to get more skill ups with a 2hs weapon, which is kind of slow, becuase it is usually a high delay and you are not dual wielding two weapons, get a faster delay 2hs weapon like a
Forged Deathsteel Longsword, unless it is marked wrong, it is the fastest, droppable and cheapest 2hs practicer for a ranger.
Also, you don't have to hit to skill up.