I've found Ilford's times for D3200 are too short to produce negs that suit me. But it varies across developers and just saying that the 3200 times are right for 1600 is incorrect. Try cutting ~4-6 frames off the start and developing them at your best guess time, then use that as the basis to work out the correct time. Or you could shoot another roll in similar light and use that to fine tune your times.
I would avoid D76 - for 1600+ speeds - TMax developer, Microphen, or DDX work better. At 1250 or below Xtol is best.
Mondesa, Swakopmund, Namibia
D3200@1000, Noctilux, Xtol.