<p>im not on adcom, but i would think ur hard course schedule and olympiad/competition stuff are ur strongest highlights.</p>
<p>Though i think u should also keep in mind that Caltech also has one of the highest (sometimes claimed THE highest) average SAT scores with both verbal and math combined… i don’t think they care too much about the writing. 
maybe it’s better to stick with ur toefl score?</p>
<p>if u applied this year, hope u did well on ur essays. :]</p>