Practice light attack weaving, and for the sustain part - don't refresh abilities until they are just about through. I improved my numbers significantly, when I didn't spam stuff like crazy, and refreshed Endless Hail/Poison Injection etc. when it was halfway through. Self buffed on a dry old non-trial dummy takes practice to sustain.

I'd suggest the following:

- Move your 13 point in Tenacity into Mooncalf
- Weapon enchants share a cooldown. So when one of your Berserker enchants goes into cooldown, the other does too and you get no benefit from enchants at all in that period. I'd switch to Damage Health poisons on the front bar (Fleshfly Larvae + Nightshade + Nirnroot) or use a poison enchant. But never, ever use two of the same enchants on weapons
- Consider moving some CP into Master-at-Arms. It will buff jabs, which is your main source of damage. I'd recommend maybe moving some out of Piercing, since you've got a Sharpened front bar weapon. I'd get a second opinion on what's the most important thing to focus on (critical damage, penetration, or direct damage) when you're lowish CP.
- If you're running solo or in groups where you're not sure if you can get Major Fracture from tanks, I'd actually recommend Spriggan's over NMG. Check your Major Fracture uptime on your parses too- what's the %?
- For parsing, I usually use Lava Foot Soup and Saltrice.
- Get your Alchemy skills to 10 and get all three points into Medicinal Use asap. That will greatly improve your potion uptime and thus increase your DPS
- Are you using Weapon Power Potions? if not, use those (Blessed Thistle + Dragonthorn + Water Hyacinth; I know there are other combos but I can't remember what they are). Before you start your parse, drink one and then wait 20 seconds. Make sure one is always up when you parse- drink another as soon as one runs out
- Gold out your bow. Golding our weapons is really important. In order of importance, weapons > armor > jewelry in terms of the DPS difference that golding out makes
- Other sets to consider as a NMG replacement (obviously you'll want a trial set eventually, but assuming you're not there yet): good ol Hunding's Rage is actually a very decent choice, Briarheart, Aegis Caller, and Leviathan are all good choices. For trial sets, if you can get your hands on the Vicious Ophidian set, that'll help your sustain. And obviously you'll eventually want Relequen and Lokke, but I'm sure you knew that.