Thanks to both RSoomak and tqFan for great ideas to work with. I’ll respond to both in this post.
@RSoomak
- fire modifiers are too low
This is true. The original build only ran around +1700% Fire before bringing in Iskandras and Invoker partial sets. “Back in the day”, the target for a build was to reach 2000% in one’s damage type, so I was fairly pleased that I managed to get there with the mods, and then add more -RR (Eldritch Fire was not part of the original build either). Again, the damage output is still too low so clearly this was not enough and perhaps I am too satisfied with just “hitting some ancient benchmarks”.
- skill tree is very butchered with some controversial choices like Skipping Fire touch but add half baked Rune of Kalastor and low rank seal
- Offensive ability have to be pushed cause every Inquisitor is crit dependent
In my defense, Rune of Kalastor was part of the meme that created the build in the first place (and I ran dual Vine rings that I had painfully farmed from Vinelton). It could be better. As for Fire Touched, to be honest I don’t really understand it. Yes, there is an extra 100% Fire at the softcap, but my OA is well north of 3200 when everything is up and I get a free -200 enemy DA from Horn of Gandarr thanks to Codex of Truths. I was never convinced this made “enough” difference in theory so never thought to push these stats. Obviously, I’ve not exactly created a build that runs SR40 nor does a sub 5:00 crucible, so I clearly still have a lot to learn. 
- Yellow pathing to get Targo on a caster also bad call immo
I have to disagree with this. Shield Wall, and through it access to 4500+ armour with decent uptime, is one of the key reasons this build could facetank SR75/6 despite only having 2% physical resistance. The build wants to stand still on a Seal because mortars don’t track moving targets very well, and I don’t see how you achieve that with a “base” armour of under 3k.
- Silvercore bolts serve better than this seals , since they got massive buff last patches
I did not know this! I have missed a few patches of active play, and will absolutely examine these! Mainly have the seals for resistances anyway…
- Hyrian and Phoenix offers more survival ability than Targo which again in caster setup is not optimal at all
While I like Hyrian, I’m on the fence about Phoenix, tbh. When I played with just adding defensive layers, both these came into the build and I couldn’t tell much difference between the variant that had Phoenix compared with the one that didn’t. I’ve tried Phoenix a few times in the past and never came away thinking, “Yeah, that’s just what I needed.” This is the complete opposite of my feelings on Targo.
@tqFan
In the back of my mind I considered trying to re-organise the pathing to work Turtle in, but never considered Crab as well. That’s a LOT of “shielding”. You are right though: the build wants to stand still and while it does a pretty good job of it there are many situations where it has to flee and all the DPS goes out the window.
Meteor → Magi
This I never considered. Is the damage comparable? Losing a 5% OA node also seems like a big deal. Doesn’t mean I’m not going to try it!
I put Solael’s Witchfire on Kalastor because it’s kinda bad on Seal I think.
Hmm, wouldn’t this be worse, though? Active seals attack at a similar rate to the recharge of Eldrich Fire, so I expect they will hit more enemies as they arrive (I try to stand on the edge of a seal and then “paint” them around me - emphasis on “try” cos I just button mash a lot as well lol). By contrast, the Rune has a recharge of 4 seconds, same as the uptime of Eldritch Fire, which means I’m only hitting 1 set of things every 4s rather than having at least 1 enemy always debuffed. My understanding of this mechanic can absolutely be questioned though!
In the meantime, I’ve also come to believe that I should equip Wyrmscale Footguards as they bring some OA/DA, and solve issues I have with elemental resistances on the actual gear (as opposed to the overly optimistic view Grim Tools presents).
You guys have given me a lot to chew on, that’s for sure. I may be a while before I return with feedback on how the changes have gone.
Huge thanks to both of you!