Should I send 2280/1600 SAT with 35 ACT?

SAT: 800 CR, 800 M, 680 W (3rd attempt)
My other attempts were
630 CR 660 M 670 W (1950)
680 CR 670 M 690 W (2040)
ACT: 35 C, 35 E, 34 M, 35 R, 34 S, 8 W(2nd attempt)
Subject Tests: 730 Math II, 680 Biology

Duke requires all SAT scores if I choose to send them, so I would have to send my two bad scores as well as my less than stellar subject tests. I know that a 35 is higher than a 2280, but a 1600 is higher than a 35. Is it worth sending the SAT and subject tests or should I stick with my 35 ACT?

Stick with the 35 ACT. Although the SAT score is great, you mention that your subject test scores are not. Duke requires all sittings of either the SAT or ACT but you don’t need to submit both. Good luck.

I would not send either.

I recommend you submit all ACT (including writing) test results – congratulations, you did quite well on both the ACT’s and the SAT’s – to comply with Duke’s specific standardized testing requirements, but not to provide the SAT Subject Test scores (as Mom1966 also suggested).