a few gear comments:
1. you don't mention augments to your feet or head- if you haven't augmented your helios- DO IT! INT/Macc/MAB/Occult Accumen would be my suggestion (what I run with) so you're building up for Myrkr to keep those chains going. NQ stones are cheap, and +1 stones flood the market with all the red mog pells out there.
2. neck- several better options out there, including an easy free one if you're killing Quetzacoatl every time, Sanctity Necklace (key stats for us being the MP +35, macc+10, MAB+10). Another is Eddy Necklace with macc+4 MAB +11.
3. waist- been discussed.
4. body- for single target, use a good augmented Helios if Alluvion Skirmish is more approachable for you now, or Wicce Coat+1 is a great option as well. You don't have to knock it out of the park with Amalric or Merlinic just yet. I know I'm not sporting either of these although of course they're on my wishlist.
5. hands- Wicce gloves+1, or a good set of augmented Helios Gloves. You'll give up the Macc by going with the Wicce though, fyi.
Basically, you can add 40 macc/MAB just by getting "perfect" augments to your two existing Helios pieces (assumming they're not augmented yet) and it's very reasonable to expect to get over 15 macc/MAB per piece without breaking the bank. Doing that would allow you to add the Wicce body/gloves+1 which would put some serious oompf to your single target nukes (keeping your reforged artifact body for AoEs, of course)
Lastly, in the debate over Amalric vs. Merlinic: They have different uses. Merlinic hands really are more geared towards SMNs, and Amalric hands have that lovely "+5 to magic bursts" that goes beyond the cap, so we're all gonna want the "old gear" anyways. Merlinic feet are a great drain/aspir potency build piece, but Amalric probably will work out to be a better overall nuking piece. Let's not throw the baby out with the bathwater, so to speak.