Yeah, the mobs you're trying to kill are a bit too high for your skill. Try Death Jackets in CN for now. Those should last you til around 125. After that, you might wanna try Orcish Bowshooters/Yagudo Zealots/Elder Quadavs in Davoi/Castle Oztroja/Beadeaux (whichever you prefer). Those should last til around 140. Then you can switch to Soldier Crawlers in CN, which should last til around 150, then switch to Blazer Beetles, which should last til about 172 or so. After that, I'd say Orcish Zerker/Yagudo Inquisitor/Gold Quadav in Davoi/Castle Oztroja/Beadueax (again, whichever you prefer) should last you until about 192 or so. After that, you'd have to level it on the coffer key-dropping mobs in those three areas.
A lot of people don't take into account a job's skill with a weapon before leveling it. For instance, those areas I listed for you will work for a DRK leveling Great Sword, but not Great Axe. This is because DRKs have an A- in Great Sword and a B+ in Great Axe.
And to Rorrixx: I'm a level 56 THF who has been trying to cap out my marksmanship as well. There's only so much you can do solo, but luckily, status bolts + THF's evasion + Utsusemi (if you're subbing NIN) lets you solo even DCs without too much trouble, once you get used to it. Keep in mind that THF has a C+ in Marksmanship. That said, you being at level 133, Soldier Crawlers should work for you until about 137-138. When they start to slow down too much for your liking, switch to Blazer Beetles, which apparently last until about 160. I'm currently at 154 myself. Blazer Beetles are DC- to us, so they can be a bit tough. Sometimes they are easy, but other times they use Hi-Freq Field, which gives evasion down. And that is lethal for a soloing THF. You best bet would be to find a friend or 2 to skillup with. When the beetles slow down, Orcish Veterans/Predators in Davoi, Yagudo Sentinels/Chanters in Castle Oztroja, and Steel/Mythril Quadavs in Beadeaux should take you to the 170 cap for level 56.
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