Should I submit a 1510 SAT (770RW, 740M) to T20s/LACs?

That is not going to rule out very many schools! 1510 is excellent. Admissions at top universities in the US seem to understand the grading system at a wide range of education systems in a wide range of countries. However, I think that a 1510 SAT score reinforces the point that you are well prepared to succeed in any university. I would submit it to any university (even the very top ones).

Where I went to high school an unweighted GPA of 3.85 would have made you by far the top student in the high school. Where my older daughter went to high school it would have barely put you in the top 10%, maybe. It is hard for us here on CC to know where this places you in your high school system.

I assume that you know that admissions to the top universities in the US is difficult to predict. However, you are a competitive student. Best wishes for your applications and education results.

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