Dueling Advice (Monk v Dragoon/other jobs... mostly Dragoon)

[Kathleen_]

I don't duel at all but it sounds like you lack a fundamental understanding of both jobs. For DRG specifically you have 4 mechanics to worry about: his increased defense, his decreased defense, his backflip, and if somehow a DRG is still alive against a MNK until he gets his LB, then the LB.
Geirskogul increases the DRG's damage but also increases his damage taken. Realistically in a 1v1 scenario he'll probably always pair this window with Horrid Roar, which increases his defense by 50%. Just keep hitting him to keep the GCD rolling because MNK is very dependable on it. Use recuperate the very single moment you lose 15k health of more, any less is a waste, and any later is a waste of server ticks regenerating MP. Ideally your strongest burst combo outside of LB is RP>Enlightenment>SSS>RP>PR>ER. Phantom Rush proccing PP is an immediate 27k burst, adding in everything else it amounts to a 49k burst in 2GCDs plus whatever you have stored in Riddle of Earth. Try hitting this when he doesn't have his defense buff up. You also should be guarding the moment you see the backflips, because that is what enables his big burst. It's as telegraphed as your big combo, which speaking of is generally RP>PR>RP>Enlightenment>SSS>LB. This should pretty much kill most jobs in the game with few exceptions, DRG not being one of them. RP is very telegraphed so make sure you don't waste all of your burst on guard. Also the placement of SSS is very important: if you stun before the knockback, there's a small window before LB where you can get a purify/recuperate off if you smash the buttons hard enough, letting even squishy ranged jobs survive. If you stun AFTER Enlightenment however, that window is gone and it goes straight into the LB's animation lock. If he somehow survives all of this (aka you fucked up something, let's be honest) and gets his LB, you will have to keep guard for LB and tank WWT with RoE.
Again I don't duel at all but realistically MNK has an incredibly minor chance of losing to DRG so keep up at it and remember to keep the GCD rolling like if it were PvE.
Edit: I just thought about it but can't you just run away from DRG LB in a duel? lol Where are the duelers when you need them.