The Lumen is 130/130! I am sorry about that thats on me. When reading the technical specs of the Lumen vs Spark, they still share a shock. The exact same stroke, and eye to eye. At 45mm of stroke, the extra travel comes from a slight change in the shocks position to make room for the motor, leading to more rear wheel travel.
Any chance you can weight the new BMC forutsrike frameset. The old one was 2300g+ and I'm betting this new one is close to 3000g just for that weak 80mm autodrop on a bike that has decending Geo but inferior 100mm suspension