If your washers are 1.5mm thick then your nozzle shouldn’t be touching the bed at -1.35mm it should touch the bed at -1.5mm. Is your nozzle screwed in all the way?
Run this test from the console, see how level your bed is in comparison to each washer:
M420 S0 ; shut off auto-leveling
G28 X Y ; home the X & Y axis
G28 Z ; home the Z axis
G29 V4 ; Perform Auto Leveling Test, verbose output
< [19:36:52] Bed X: -3.000 Y: -9.000 Z: 0.665
< [19:37:08] Bed X: 282.000 Y: -9.000 Z: 0.483
< [19:37:26] Bed X: 282.000 Y: 291.000 Z: 0.586
< [19:37:44] Bed X: -3.000 Y: 291.000 Z: 0.410
.665 - .410 = .255
In the example above the max difference is .255. What’s yours?