No you are being stubborn, if both melees are capped on hate it will be the one who hits more frequently that gets the largest amount of attention from the boss.
I am aware my sam is not typical but generally on our chariot fights I do around 65-70% (more in the case of LAC but the same rules don't apply as hate is reset on people every 25%) of the total damage with the 4/5 Usu, BB mnk doing the remainder. Even with me doing a large amount more damage, by the time the chariot is below 75% both of us are at CE and VE hate cap and the mnk actually sees more attention from the boss just because of the fact it attacks faster.
Also no, chariots higher defense and level don't have a greater impact on WS damage compared to any other monster in the game. Sams have a large attack boost in Y/G/K which allows them to put out much higher WS numbers than they would on higher level targets.
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