PCGS has been really rough lately and from standpoint undergrading coins. on this one the only way you get to 53 is if they are really whacking it for strike.
I would not resub the coin and really dont deal with CAC. NGC might give it a 55 but the difference in price doesn't really make it worth doing unless they would put a 58 on it which probably wouldnt happen
its still a beautiful coin and imo worth 55 money