I don't think anyone on the forum has done the math behind the 340% limit. There has to be some reason behind why Nordeus set this number.
Anyone want the work?
If a 1 position player ( for example MC) who has 10 white skills has 340% on all 10 skills - how many stars would that player have?
By setting the limit at 340% have Nordeus effectively capped the number of stars a player can have without spending rest packs to gain extra positions? Of course they have.