So you can confirm that GAME modules still drop after Season 4 started? I am guessing it is about the same amount of grind pre-7.2.1? I agree that the grind is maddening frustrating that to get enough Modules for weekly cap it took me an entire day (and that is without Jawa Intel, I dont exactly know how to farm purple Jawa Junk or have an income for doing that). The grind is so long and horrible that I rather do HK-51 parts then do this grind but I want the reputation to be over with because I'm already a Champion and so close to Legend.
GAME Module didn't specify which mobs or planets drop faster hence why it is slower perhaps. I already finished the Shadow Syndicate grind before Season 3 started (I didn't finish it during Season 2 either. I finished the grind inbetween 2 and 3) but since it said that mobs drop higher in Syndicate planets, I farmed Shadow Syndicate Plans in Nar Shaddaa (since it is the lowest level planet for imps, for pubs I would go to Coruscant) and although it has been a year since I done so, iirc the syndicate plan drops were significantly faster then the GAME modules and that was before I discovered Jawa Intel was a thing.