Autumn was previously in but was removed as it served no purpose other than to basically replace the Marathon and (to some extent) the Valiant. It will make a return in a post Human-Covenant war version of the mod the devs are planning on making once they're finished with this, along with presumably the others you listed. Honestly, I hate to say it, but the mod is not really the issue here. Myself along with many others don't have the same issue, however this mod does have a pretty steep learning curve compared to the base game and other mods. I suggest heading over to the discord for help, it's hard to give advice without knowing more.
keebs63
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