I’d exchange the Dragoon C1 with Doppel C2 for 100% more damage with 10 stacks of DOV while DOV has also 100% uptime. Dragoon only provides you with more attack skills, but you won’t get the Serpentine debuff unless you go Dragoon C2 and the base skills of Dragoon cost more SP to execute while having lower average damage.
DOV is also not so punishing as the def reduction will be decreased from 10% per stack to 5% per stack [already live in KTOS since December 2016) and the Crush attribute decreases the enemies attack or defence by up to 50% for 10 seconds (which is basically more than a 50% damage reduction since defence works as a flat reduction), making the defence loss neglectable if you manage to kill the monsters within 20 seconds[ since Crush has 2 overheat charges this can be used to get 20 seconds of decreased damage].
This would also provide you with the ability to improve Cyclone and Punish to increase your overall damage (as these are ± the only skills that don’t require a 2handed sword to execute, and Mordschlags CD time is too high to deliver considerable damage).