Given that you’ve already taken three standardized tests, it’s unlikely that you’ll see a meaningful increase, if any. If you’re not prepping, even less so.
A third SAT/fourth overall test isn’t going to raise eyebrows as being too many, but unless you just enjoy taking tests, I wouldn’t bother.
Fwiw, 35 (34.75) and 1540 are exact equivalents on the official concordance.