well, this may help though I think adding 4-5% phys res won’t hurt anyone. the fact is that high armor works well with medium-high phys res (so they matter both) while with low phys res it doesn’t work that good.
like, Justicar set has both %armor, %absorb and some phys res so maybe LD can get the same treatment.
there was a thread Physical Resistance to Light's Defender set about LD set some time ago and that build had whooping 3% phys res.
Purifier, Level 100 (GD 1.1.9.4) - Grim Dawn Build Calculator in my GT I went for probably every source of phys res possible but it’s only 17% in the end (used to be 22 but phys res on affixes was gutted, especially the Sandstorm one that lost 6(!) of it with no compensation). that’s still kinda low for a caster that needs to facetank everything.
another two points I wanna talk about is 1) the full set skill and 2) flat to Stun Jacks.
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the crystal summon for full LD set is kinda useless. it has low lifetime, so you can have only 2 at a time, and kinda meh damage so it’s better not to use it at all.
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flat damage bonuses to Stun Jacks are almost absent. you have them on Harra and some on LD but that’s it, everything else is just e-cute. for a spammable skill, tho, it is better to have flat to leech from it (and the leech is also like halved because of the transmute). So I suggest to change some e-cute bonuses to SJs to flat ones (on ammy or off-hand) or add some flat to, say, that sword.