I sometimes use a Nikon 4T closeup lens with the 120 AMED, and am very happy with it. That is a formidable combination. Offhand I don't remember how far the AMED stops down, maybe f/45, but I recall that it often isn't enough by a long shot and one has to think about movements to try to get a bit more focus control.
My latest macro weapon is the rz 110/2.8 adapted to LF; the lens is so bright that you really can work on the movements very effectively, even at high mag (beyond 3:1). The lens certainly isn't optimized for that kind of thing, and it'd not be a good setup if field curvature is a concern, but for everything else... bear in mind that a fast smaller format lens, at high mag, will cover LF. So I have put various nikon lenses, reversed, in a press shutter.
Experiment and have fun!
I use a Schneider Macro 120mm HM Symmar with 5x4, and used in conjunction with a Maxwell HI-LUX Ultra Brilliant Matt 4.7 focussing screen gives a bright image. I think the Schneider lenses are slightly brighter and easier to focus than the Rodenstocks, though this may be a subjective experience derived from my own lenses. I consider the DOF, stopped down within the optimum range, at a magnification of 3x to offer a few millimeters of sharp focus. With macro lenses you will get much better results than either reversing a lens or using a close-up lens. If you shop around, you can buy a Macro lens in good condition for a few hundred pounds. I paid around £400 for a mint Schneider last year.
I can extend my magnification by mounting the lens on a top hat and using Ebony's extension back which gives me an extra 90mm draw to my camera's bellows 365mm draw. The top hat adds an extra 35mm draw to that.
I see its available at Amazon.com, I've had my copy for almost 20 years. Very good book many charts and tables of info, and loads of how-to and home built gear.
i found one on ebay for 8 pounds sterling.