If you have 3 x 2 ohm speakers, you’re only going to be able to wire them at .67 ohms. All of your speakers need to have the exact same voice coils, or the system is going to be unbalanced, which will cause possibly electrical and definitely some distortion problems. You never wanna mix and match any subs except the exact same subs in every fashion, optimally. Mixing and matching different ohm voice coils will cause the lower ohm voice coil to receive more power than the higher ohm ones, which will probably lead to damaging voice coils.
Clarity edit: if you do 3x 2 ohm dvc to 4 ohms then parallel each sub, that is 1.3 ohms. I slightly misread your post, sorry.