I recently got back into GW, the primary reason just to complete HoM as a personal goal (started this game back when I was in middle school like a decade ago, and want to say I "completely" finished it

I've been testing out and playing various 7H builds, since I have no guild and no friends who play anymore. I run a N/x as my primary, and I'm currently using the Dual Fire Ele build on PvX, and am currently getting the 2nd RT hero so I can turn Razah into 3rd Me (for Glint mission, etc.)
I just started playing in HM, and I'm having some trouble not stacking up DP/occasionally getting wiped, and trying to figure out what I'm doing wrong, and could use any helpful suggestions from veterans.
I know one thing for sure is that I definitely need to agro better and not just bum rush into a group of enemies. Learned a couple of techniques from the awesome guides in here.
One question though: are there better primary professions to be than others? I'm using my N/ as a IV pod healer, running the Dual Ele PvX build, and have a SOGM Rt (so 2 of Ne/E/Me/Rt) not mentioned in the build. Something I find extremely hard to deal with esp in HM is positioning. I can ignore melee AI in NM, but in HM, their increased atkspd and damage can't be ignored as they shred my team apart, and it seems a lot of the enemy don't really clump up as neatly for AoEs compared to NM. I see my Ele wasting a lot of their AoE (meteors esp noticeable) spells on a single spellcaster (yes, I targeted them, but because they're high priority). Should I switch my RoJ monk to a UA monk? RoJ also makes the enemy scatter.
Another is the fact with all of us as back line mages, I also feel in HM my team is severely lacking in defense. Gwen does a great job at interrupting spellcasters (I get wiped if she gets interrupted first though), but my Ineptitude Me is having trouble dealing w/ the W&As that rush at the team.
Do you guys think playing as a W or A would make things easier to manage? I was watching some Youtube videos, and typically players who use W or As tank and agro very efficiently.
With completing HoM also in mind, I was thinking maybe playing as a W or A would also help for map exploration, farming, etc.
What do you guys think?