I suppose I could be wrong, but the WR2 1.25 has an exposure of just under 0.2 mm, so adding 0.3 mm of shim (3 blades) will definitely get you to the same gap, but I don't think it can get you to the 0.4 mm exposure of the WR2 1.55.
For instance, on the GreenCult 2.0 IV plate - it has a gap/exposure of 1.05/0.2 mm with no shims, but if I add 2 blade shims (0.2 mm), I definitely get to 1.25 mm gap, but I measured the exposure to only increase to ~0.25-0.27 mm. I measured it by loading a blade and shims, taking a picture of the head end-on and then measuring a dimension that was in that picture (in this case, the distance from the bottom of the plate to the top of the cap) with calipers. I then used Adobe Illustrator (I'm sure Microsoft paint would work fine too) to draw a line from the bottom of the plate to the top of the cap (which the program then reports the length of the line in pixels). This gives you a mm/pixel conversion and you can do whatever measurements you want pretty accurately like this. Intuitively, the gap should directly increase by the measured amount of shim you add, and it definitely did and was verified by my measurement, but the exposure increases more slowly with added gap. This makes sense after drawing it out.
I too have been toying with the idea of getting a WR2 1.55 and just kinda wanted to use what I had to see if that was too much exposure/gap for me. I'm going to continue to add shims and see how the shaves are, but I found that I could shave much much steeper even with just 2 shims and I felt that the efficiency increase was pretty extreme while still being very gentle on my skin - actually, much more gentle than without the shims. I think this is just because my skin much more agrees with steep angle shaving than shallow.
Also, just as a point of reference, I shave every day - so I'm just shaving short stubble, but I feel like I have to go over areas way too many times to get them smooth and it was adding lots of irritation. This new configuration with shims is such a drastic improvement. It's really got my wanting to put my name on the list for a WR2 1.55.
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