Dragoons need to be buffed...

[Lemon8or]

HT+ID+DB+CT+PB+TT+VT+FT+HT+TT+VT+FT+PB

Actually, if you want to use rotation, here:
HT-ID-Dis-CT-Ph-TT-VT-FT-HT-TT-VT-FT-Ph-ID-Dis-CT-HT-TT-VT-FT-Ph-TT-VT-FT
Sure, it would seem that DRG would lose 230 potency (+100-330 Math is hard) over the duration of this rotation, but wait there's more. If you continue with a FT while the optimal rotation goes to HT, you actually only lose 70 potency. The point is how much you lose also depends on where in the rotation you end it.
DRG: mandatory position, missed positional on 1 attack results in very varied, higher potency loss on average, only have 5 skills to hit in a 24 GCD rotations.
MNK: non-mandatory position, missed positional on 1 attack results in lower potency loss on average, have to worry about that 24 times in a 24 GCD rotations.