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i dont think using a mythic harms you with a harder pvp matchmaking, neither will harm you leveling/traiting troops, all those factors will have impact on the weakest enemy you are offered with (assuming the weakest offered is something around your actual team score) but not the hader two
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here is what i think is most reliable info about match making i could find so far
The New Defend Meta - #106 by DonBoba
im not gonna explain this to not make too much mess but i believe it is very right… unless devs changed something from that time until now -
the reason you are facing harder opponents i think is your account level which is unavoidable (perhaps guild bonus too?)
-to be more precise i think there exist some level brackets and you just advanced recently to a higher level bracket meeting higher levels (pay attention to that and let us know is this correct please
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thats all i can find for now however, @Mithran might be also correct on this: