If the oil level is too high the crank picks it up and overloads the bores with it causing excessive oil consumtion.
If the 1600 is in a mk1 then possibly it has a 1300 sump fitted, so maybe you should be checking the oil capacity for the 1300.
I would measure how far the crank hangs down from the bottom of the engine and transfer that measurement plus a little for clearance down from the top of the sump to ascertain the oil height then fill the sump to this level taking note of the amount of oil. Then put the dipstik in the engine and file a groove at the calculated height. A little more will be needed to fill the oil filter.