Personally I'd prefer not having a jar unless you need it for generics or whatever, at least until the mod is not being updated quite so often (closer to a "finished" state). Makes it easy to modify stuff. It doesn't seem to load slowly for me either.
It's your mod so do whatever you think is right; just giving my preference.
I found a few things to fix. The energy weapon blueprint has a typo: eb instead of en. I dunno if you want them to use the weapon blueprint graphic; if you do they need to be set to bp_rsf_w.png
"rsf_wpackage_bal":"graphics/icons/cargo/bp_rsf.png",
"rsf_wpackage_eb":"graphics/icons/cargo/bp_rsf.png",
"rsf_wpackage_mis":"graphics/icons/cargo/bp_rsf.png",
Same thing on these: typo and not set to weapon blueprint graphic.
"isa_wpackage_eb":"graphics/icons/cargo/bp_isa.png",
"xle_wpackage_eb":"graphics/icons/cargo/bp_xle.png",
"uin_wpackage_eb":"graphics/icons/cargo/bp_uin.png",
In special_items.csv the RSF energy weapons blueprint tag (plugin params column) has incorrect capitalization, so the blueprint package doesn't give any of the weapons.
Should be
You're making good progress, keep it up!