For a PvE (haz res) build I would definitely change a lot:
1) ditch the shield cell, instead go for a g4 thermal resistant fast charge experimental Bi-Weave.
2) ditch all multicannons except one with corrosive experimental, I would go for high cap, you want to apply corrosive to as many targets as possible but not the multi as damage dealer
3) go with as many beams as your distributor can handle, go fixed beam if you can keep time-on-target yourself, otherwise gimbal
4) maximize your resistances to 50% in all categories
5) I went the way to raise shield levels with guardian shield reinforcements in my PvE Chieftain, cause the base level is quite low.
6) For a PvE vessel a high shield is better then a high hull because shields recover, your hull not. ditch one MRP, the repair limpets and as much HRPs as you are confident to survive if your shields drop
7) if you do wing combat (Mobius is great for that, ping my CMDR if you're on PVE Eurasia if you like to wing up), add at least one regeneration and one concordant experimental to your beams, your wingmates will have the same usually (that's why I ditch the SCB)
8) add a kill warrant scanner of the highest possible grade with fast scan modification
9) it's enough to use D rated long range 5 sensors, the range loss is only half a kilometer or so, but definitely enough for a haz res
10) if you have spare optionals, add a collector limpet controller for those sweet mats...
This is my new Chief build over the Weekend:
https://s.orbis.zone/nkv
edit: sounds like a lot of criticism, but a lot is just preference and my fighting style with friends in a wing. your ship is basically fine as it is...