[Sabaron]

All /nin gives you is shadows. Dual Wield only gives you an off-hand weapon; TP gain is roughly the same regardless. What /drg will offer is more swings that won't hit for 0, thus netting you good TP returns.

Well, I don't think you're selling /NIN quite well enough. Remember that Dual Wield gives you a 10% delay reduction which is better than the 5% Haste you're getting from Wyvern Earring. Also remember that Jump's value decreases with very light weapons like daggers that return roughly 5% TP per hit (as opposed to the 13% range of larger weapons like lances). Therefore, Jump is only giving you 5% TP every 90 seconds which isn't great, and I'm sure isn't equivalent to the extra 5% Haste you lose from not having Dual Wield.

You can also use /NIN to get Dual Wield at 20th level, 10 levels before you can use Wyvern Earring.

I'm pretty sure you haven't sold me on /DRG yet. I am, however, with you on /SAM at 60+.