I know your feeling bro. Last time, I got 2 Silver in 2 10 draw from regular gacha and I endend with a salt mine from FG gacha.
And yeah, 3* should be banned from FG gacha and their chance should be increased in regular gacha.
DMM knows that even 4* are trash (sorry 4*, I still love you). And they keep trashier trash in the gacha. At least 4* would be slightly better and less salty trash with their higher Bond Crystal value.