i was the same as u.
i had 320 implants in 12yrs ago. i needed them changed as i had ripples after having 3 more babies.
i had them redone last week with 525 and was worried they would be massive.
im glad i went to 525 as they done look that big at mo. im wearing 34f sports bra and was a 32c/d before.
i would go for 525 as there wont be much diff between 460 and 525 anyway. about half cup size i think.
hope this helps lol