Is it a good idea to send multiple GRE scores?
I doubt that sending the second one would make any difference. The ETS seems to consider a 3.5 and a 4.0 on the AW test as nearly equivalent.
https://www.ets.org/gre/revised_general/prepare/analytical_writing/score_level_descriptions/
Assuming this is the US, the GRE scores are only a small part of any decision in any case.
At the moment, also, coronavirus is making the GRE both less useful and less used.