Trophies Awarded and Matchmaking

Im a decent lvl 106 th9 pushing to champs but with the new update, matchmaking has become a living hell. Though i can attack anyone, a very developed th10s is the only level of a player i can attack that would be worth the effort at a high risk decent reward evertime. When finding an opposing th9 the offer is "usually" a 6 to 15 trophy gain w/ a 3 star and with a 20 to 34 trophy LOSS for defeat. Sometimes there is the very solid th9 offering 20+ trophies but they only show after a while searching. i also find it unessaery to find a rarity of a th8 whos in crystal 2 and me being masters 2 with a 1 cup offer and a 35 cup lost as well as having NO LEAGUE LOOT BOUNS. There is a mathematical equation to loot penalties/bonuses but what is the science behind trophy count. What determines how many trophies one can gain or lose to and from another. We all know the higher up you go the lest cups you get and viscera for going lower down(lets say bronze 3 you get 40+ and could lose up to 0>3 and in champs you can gain 1 but can lose up to 30+) but someone please figure this algorithm out, because i cant and its frustrating af.