With the new size of dag 383 there is some way to have full hashrate on 4gb cards or to improve my hashrate?

--4g-alloc-size 4080 --keepfree 5 epoch          382: 385MHS
--4g-alloc-size 4080 --keepfree 5 epoch          383: 358MHS

All this on a 13 RX570 4GB RIG