This is the exact frustration I had after installing my Signature Plastics SA Symbiosis keyset on mx Clears. The spacebar would return IF you bottomed out the switch, but if you were gentle with your space keystrokes, the switch would not fully return. I ended up selling the set as I don't have enough experience soldering to feel comfortable desoldering the LED. OP if you do end up going through with the desoldering, would you mind updating us on how it goes?