You can also put a ND 0,6 filter on your lens. I have Rodenstock; 40,5mm ND 0,6. Not necessary with B&W but with color RA-4 paper you need it. The smallest prints I am making is 13x18cm. You can also change the lamp Osram HLX 100W to HLX 75W but this is only a minor difference. Split Grade needs also a bit more light and with this system it doesn't matter when the times are short.

Best regards,