You would need each coil to be at 3 ohms in order to have dual
coils reading 1.5ohms on the provari.
I would say try 4/5 on one coil and test it. If it is around 3 then build the second coil. But 2
coils at 2 ohms will be 1 ohm total, because they are parallel connections.
Edit: it may take a 5/6 because i think 4/5 will be around 2.5ohms, putting you are 1.25 to 1.3 total