Of course, with such a large paint dilution, the pressure should also be reduced. I use about 1 bar pressure.
I think that if you are not happy with the effects when painting with a 0.2 mm nozzle you can try to buy a 0.4 mm nozzle/needle set, I suggest a newer type without this perforated housing (unless you have a 2 in 1 set, in which it was located such a nozzle). In addition to H&S Evolution Silverline, I also have Iwata HP-BH, where the paint structure is similar at a dilution of 50:50 as for H&S Silverline 70:30. Unfortunately, painting with acrylic is not easy. Two days ago I tried to paint a semi-matte black Tamiya and only using Mr. Gunze Color Leveling Thinner obtained a satisfying effect both with H&S and Iwata.